principal+maximum

en\ \ principal shear stress

ipse ( ipsus, Cato, R. R. 70; 71; Plaut. Ps. 4, 7, 43; id. Trin. 2, 2, 40; 3, 1, 10 et saep.; Ter. And. 3, 2, 15; id. Eun. 3, 4, 8, id. Hec. 3, 5, 5; Jusjur. Milit. ap. Gell. 16, 4, 4 al.), a, um (ipsud, Gloss. Philox.); gen. ipsīus ( poet. also ipsĭus, Cat. 64, 43; Verg. A. 1, 114; 2, 772 al.; and dissyl. Ter. Heaut. 3, 3, 15; id. Phorm. 4, 5, 13: ipsi, Afran. ap. Prisc. 694); dat. ipsi (ipso, App. M. 10, p. 243, 24); pron. demonstr. [is - pse for pte; cf. sua-pte and -pote in ut-pote; root in potis; Sanscr. patis, lord, master; hence, = he, the master, himself, etc.; cf. Pott. Etym. Forsch. 2, 866 sq.; Fick, Vergl. Wörterb. p. 116. Hence, in the original form, the pronoun is was declined, while the suffix was unchanged; thus eopte = eo ipso, Paul. ex Fest. p. 110:

eapse = ea ipsa,

id. p. 77; nom. sing. eapse, Plaut. Curc. 1, 3, 4; id. Cist. 1, 2, 17; id. Rud. 2, 3, 80; 2, 5, 21 al.; acc. eumpse, Plaut. Most. 1, 4, 32:

eampse,

Plaut. Aul. 5, 7; id. Cist. 1, 3, 22; id. Men. 5, 2, 22 al.; abl. eopse, Plaut. Curc, 4, 3, 6:

eāpse,

id. Trin. 4, 2, 132; id. Curc. 4, 3, 2; v. Neue, Formenl. 2, 197 sq.], = autos, self, in person, he (emphatic), himself, herself, itself, used both substantively and adjectively, to denote that person (thing) of which something is eminently or exclusively predicated.

In gen.

With substt. or pronn.

Expressing eminence or distinction:

ipse ille Gorgias... in illo ipso Platonis libro,

Cic. de Or. 3, 32, 129:

ille ipse Marcellus,

id. Verr. 2, 2, 2, § 4:

natura ipsa,

id. Brut. 29, 112:

dicet pro me ipsa virtus,

id. Fin. 2, 20, 65:

ipsa res publica,

id. Fam. 3, 11, 3:

neque enim ipse Caesar est alienus a nobis,

id. ib. 6, 10, 2:

ipse Moeris,

Verg. E. 8, 96:

rex ipse Aeneas,

id. A. 1, 575:

ipse aries,

id. E. 3, 95:

ductores ipsi,

id. A. 1, 189:

si in ipsa arce habitarem,

Liv. 2, 7, 10;

esp. freq. with names of gods, etc.: naturas quas Juppiter ipse Addidit,

Verg. G. 4, 149; id. A. 3, 222; Hor. C. 1, 16, 12:

Pater ipse,

Verg. G. 1, 121; Tib. 1, 4, 23:

Venus ipsa,

Hor. C. 2, 8, 13; Ov. H. 19, 159:

ipse pater Pluton,

Verg. A. 7, 327 et saep.—Prov.:

audentes deus ipse juvat,

Ov. M. 10, 586.—

For emphasis or in contrast, very, just, precisely, self, in person:

adest optime ipse frater,

Ter. Eun. 5, 2, 66:

in orationibus hisce ipsis,

Cic. de Or. 1, 16, 73:

ea ipsa hora,

id. Fam. 7, 23, 4:

nec carmina nobis Ipsa placent: ipsae rursus concedite silvae,

Verg. E. 10, 63:

tute ipse his rebus finem praescripsti,

Ter. And. 1, 1, 124:

lepide ipsi hi sunt capti,

Plaut. Bacch. 5, 2, 91:

ego enim ipse cum eodem isto non invitus erraverim,

Cic. Tusc. 1, 17, 40:

ipse ille divinationis auctor,

id. Div. 2, 28, 61:

cariorem esse patriam quam nosmet ipsos,

id. Fin. 3, 19, 64:

eaque ipsa causa belli fuit,

the very, the true cause, Liv. 1, 57, 1; esp. with is, in all persons and numbers:

estne hic Philto? Is hercle'st ipsus,

Plaut. Trin. 2, 4, 31:

cui tutor is fuerat ipse,

Liv. 5, 33, 3:

jam id ipsum absurdum, maximum malum neglegi,

even, Cic. Fin. 2, 28, 93 (Madv.); id. de Or. 2, 30, 132:

tempus ad id ipsum congruere,

Liv. 1, 5, 5:

duum vir ad id ipsum creatus,

id. 2, 42, 5:

Tullius et eos ipsos et per eos multitudinem aliam deduxit,

id. 2, 38, 1:

eorum ipsorum facta (opp. loca in quibus, etc.),

Cic. Fin. 5, 1, 2:

nec vero clarorum virorum post mortem honores permanerent, si nihil eorum ipsorum animi efficerent,

id. de Sen. 22, 80:

ad eum ipsum honorem deferre,

Liv. 3, 51, 3; so sometimes with an inf. or subst.-clause:

ipsum dicere ineptum,

Cic. de Or. 1, 24, 112:

quid juvat quod ante initum tribunatum veni, si ipsum, quod veni, nihil juvat?

the mere fact, the fact alone, id. Att. 11, 9, 1:

ipsum, quod habuisti,

Sen. Cons. ad Marc. 12, 2:

et ipsum, quod sum victus, ama,

Luc. 8, 78.— Esp. in legal phrase: ipso jure, by the letter of the law, in legal strictness or precision, Gai Inst. 2, 198; 3, 181; 4, 106 sqq. et saep.—

Alone, emphatically taking the place of an omitted person. or demonstr. pron.: Ar. Ubi is nunc est? He. Ubi ego minume atque ipsus se volt maxume, Plaut. Capt. 3, 4, 108; 4, 1, 10: Su. Is ipsusne's? Ch. Aio: Su. Ipsus es? id. Trin. 4, 2, 146:

atque ipsis, ad quorum commodum pertinebat, durior inventus est Coelius,

Caes. B. C. 3, 20, 4:

quaeram ex ipsā,

Cic. Cael. 14:

tempus, quo ipse eos sustulisset, ad id ipsum congruere,

Liv. 1, 5, 5:

agrum dare immunem ipsi, qui accepisset, liberisque,

id. 21, 45, 5; 9, 34, 18; 10, [p. 999] 6, 10:

laeta et ipsis qui rem gessere expugnatio fuit,

id. 28, 4, 1:

a nobis exposita, ut ab ipsis, qui eam disciplinam probant,

Cic. Fin. 1, 5, 13.—So freq. in Cic. before a rel.:

ut de ipso, qui judicarit, judicium fieri videretur,

Cic. Inv. 1, 44, 82:

ipsi omnia, quorum negotium est, ad nos deferunt,

id. de Or. 1, 58, 250; 2, 14, 60; id. Div. in Caecil. 4, 13; v. Madv. ad Cic. Fin. 2, 28, 93:

nullis definitionibus utuntur, ipsique dicunt ea se modo probare, quibus natura tacita assentiatur,

Cic. Fin. 3, 12, 40 Madv. —

To make prominent one of two or more subjects of any predicate, he ( she, il), for his part, he too, also, as well.

Ipse alone:

litterae Metello Capuam adlatae sunt a Clodia, quae ipsa transiit,

i. e. also, in person, Cic. Att. 9, 6, 3:

Italiam ornare quam domum suam maluit: quamquam Italia ornata domus ipsa mihi videtur ornatior,

id. Off. 2, 22, 76:

tris ipse excitavit recitatores,

he too, id. Clu. 51, 141:

neque tanti timoris sum ut ipse deficiam,

Caes. B. C. 2, 31, 8:

Jugurtha, tametsi regem ficta locutum intellegebat, et ipse longe aliter animo agitabat,

Sall. J. 11, 1:

hoc Rhipeus, hoc ipse Dymas omnisque juventus Laeta facit,

Verg. A. 2, 394.—

With conjunctions.

With etiam (class.):

ipse etiam Fufidius in numero fuit,

Cic. Brut. 29, 112: scribebat orationes quas alii dicerent: quamquam is etiam ipse scripsit eas, quibus pro se est usus, sed non sine Aelio;

his enim scriptis etiam ipse interfui,

id. ib. 56, 206 sq. —

With quoque:

quippe quia plebs senatus consultum solvit, ipsi quoque solutum vultis,

Liv. 3, 21, 4:

consul, quia collegae decretum triumphum audivit, ipse quoque triumphi flagitator Romam rediit,

id. 8, 12, 9:

cum subito Sulpicius et Albinovanus objecissent catervas, ipse quoque (Sulla) jaculatus, etc.,

Flor. 3, 21, 7.—

With et (et ipse = kai autos, ipse etiam; rare in Cic.; cf.

Zumpt, Gram. § 698): tamen et ipsi tuae familiae genere et nomine continebuntur,

Cic. Caecin. 20, 58:

deseret eos quos una scis esse, cum habeat praesertim et ipse cohortis triginta?

id. Att. 8, 7, 1; id. de Or. 1, 46, 202:

Cornelius dictatorem Aemilium dixit, et ipse ab eo magister equitum est dictus,

Liv. 4, 31, 5:

credo ego vos, socii, et ipsos cernere,

id. 21, 21, 3:

Cornelio minus copiarum datum, quia L. Manlius praetor et ipse cum praesidio in Galliam mittebatur,

id. 21, 17, 7:

qui et ipse crus fregerat,

Suet. Aug. 43:

Antoninus Commodus nihil paternum habuit, nisi quod contra Germanos feliciter et ipse pugnavit,

Eutr. 8, 7:

virtutes et ipsae taedium pariunt,

Quint. 9, 4, 43. —

With nec ( = ne ipse quidem):

primis repulsis Maharbal cum majore robore virorum missus nec ipse eruptionem cohortium sustinuit,

Liv. 23, 18, 4:

nihil moveri viderunt, nec ipsi quicquam mutarunt,

id. 37, 20, 8:

neque ipsi,

id. 30, 42, 7: crimina non quidem nec ipsa mediocria;

sed quid ista sunt prae iis, etc.,

id. 34, 32, 9.

Esp.

By way of eminence, ipse is used to indicate the chief person, host, master, teacher, etc.:

ipsa, the mistress, etc.: ipsus tristis,

Ter. And. 2, 2, 23:

ipsum praesto video,

id. ib. 2, 5, 3:

ego eo quo me ipsa misit,

Plaut. Cas. 4, 2, 10:

suam norat ipsam tam bene, quam puella matrem,

Cat. 3, 7 (Müll., ipsa); cf.:

Pythagorei respondere solebant, ipse dixit,

i. e. Pythagoras, Cic. N. D. 1, 5, 10; cf.:

nec hoc oratori contingere inter adversarios quod Pythagorae inter discipulos potest ipse dixit,

Quint. 11, 1, 27:

cum veniat lectica Mathonis plena ipso,

the great man, Juv. 1, 33:

anseris ante ipsum jecur,

before the host, id. 5, 114.—

Of or by one ' s self, of one ' s own accord = suā sponte, ultro:

videar non ipse promisisse (opp. to fortuito),

Cic. de Or. 1, 24, 111:

de manibus delapsa arma ipsa ceciderunt,

id. Off. 1, 22, 77:

valvae clausae se ipsae aperuerunt,

id. Div. 1, 37, 74:

ipsae lacte domum referent distenta capellae Ubera,

Verg. E. 4, 21:

ipsi potum venient juvenci,

id. ib. 7, 11; cf.:

aliae ipsae Sponte sua veniunt,

id. G. 2, 10:

fruges sponte sua (tellus) primum ipsa creavit,

Lucr. 2, 11, 58; and autai for automatoi, Theocr. Idyll. 11, 12.—

Himself exclusively.

By or in one ' s self, alone:

haec ipse suo tristi cum corde volutat,

Verg. A. 6, 185:

his actis, aliud genitor secum ipse volutat,

id. ib. 12, 843: tempus secum ipsa Exigit, id. ib. 4, 475:

quam facile exercitu soclos conservaturus sit, qui ipso nomine ac rumore defenderit,

Cic. de Imp. Pomp. 15, 45:

multa secum ipse volvens,

Sall. C. 32, 1:

aestimando ipse secum,

Liv. 25, 23, 11.—

In one ' s self, for one ' s own sake:

ipsam aequitatem et jus ipsum amare,

Cic. Leg. 1, 18, 48.—

Of one ' s self, of one ' s own nature, etc.:

erat ipse immani acerbāque naturā Oppianicus,

Cic. Clu. 15, 44:

duo imperatores, ipsi pares, ceterum opibus disparibus,

Sall. J. 52, 1:

natura serpentium, ipsa perniciosa, siti accenditur,

id. ib. 89, 5.—

With advv. of time.

Nunc ipsum, just now, at this very time:

nunc ipsum exurit,

Plaut. Bacch. 4, 9, 16:

nunc ipsum non dubitabo rem tantam adicere,

Cic. Att. 7, 3, 2; 8, 9, 2:

nunc tamen ipsum sine te esse non possum,

id. ib. 12, 16. —

Tum ipsum, just then, at that very time:

id, quod aliquando posset accidere, ne tum ipsum accideret, timere,

Cic. de Or. 1, 27, 124:

ratio largitionum vitiosa est, temporibus necessaria, et tum ipsum ad facultates accommodanda est,

id. Off. 2, 17, 60:

et tum ipsum, cum immolare velis, extorum fieri mutatio potest,

id. Div. 1, 52, 118; cf. id. Fin. 2, 20, 65 Madv.—

With numerals, just, exactly, precisely (opp. fere):

triginta dies erant ipsi, cum, etc.,

Cic. Att. 3, 21 init.:

ipsas undecim esse legiones,

id. Fam. 6, 18, 2:

nam cum dixisset minus 1000 (sc. milia), populus cum risu acclamavit, ipsa esse,

id. Caecin. 10, 28; cf. id. Brut. 15, 61; 43, 162:

ipso vigesimo anno,

id. Verr. 2, 2, 9, § 25. —

In reflexive uses,

Ipse strengthens the subject when opposed in thought to other agents; the object, when opposed to other objects; cf. Zumpt, Gram. § 696; Kennedy, Gram. § 67, 3; Madv. Gram. § 487, 6. — Hence,

With subject.

In gen.:

non egeo medicina (i. e. ut alii me consolentur), me ipse consolor,

Cic. Lael. 3, 10:

Junius necem sibi ipse conscivit,

id. N. D. 2, 3, 7:

neque potest exercitum is continere imperator, qui se ipse non continet,

id. de Imp. Pomp. 13, 38:

Artaxerxes se ipse reprehendit,

Nep. Dat. 5:

ipsa se virtus satis ostendit,

Sall. J. 85; cf.:

deponendo tutelam ipse in se unum omnium vires convertit,

Liv. 24, 4, 9:

deforme etiam est de se ipsum praedicare,

Cic. Off. 1, 38, 137.—

With special emphasis, ipse is joined to the subject to indicate its relation to itself as both subject and object, though the antithesis would suggest another case (Cic.):

cum iste sic erat humilis atque demissus, ut non modo populo Romano, sed etiam sibi ipse condemnatus videretur,

Cic. Verr. 1, 6, 17:

si quis ipse sibi inimicus est,

id. Fin. 5, 10, 28:

qui ipsi sibi bellum indixissent,

id. ib. 5, 10, 29:

quoniam se ipsi omnes natura diligant,

id. ib. 3, 18, 59:

nam si ex scriptis cognosci ipsi suis potuissent,

id. de Or. 2, 2, 8.—

With object:

neque vero ipsam amicitiam tueri (possumus), nisi aeque amicos et nosmet ipsos diligamus,

Cic. Fin. 1, 20, 67:

omne animal se ipsum diligit,

id. ib. 5, 9, 24:

fac ut diligentissime te ipsum custodias,

id. Fam. 9, 14, 8:

Pompeianus miles fratrem suum, dein se ipsum interfecit,

Tac. H. 3, 51:

Lentulum, quem mihi ipsi antepono,

Cic. Fam. 3, 7, 5.—

Ipse defines the subject of a reflexive pronoun:

natura movet infantem, sed tantum ut se ipse diligat (where ipse shows that se refers to infantem),

Cic. Fin. 2, 10, 33: proinde consulant sibi ipsi;

jubeant abire se,

Just. 16, 4, 15:

neque prius vim adhibendam putaverunt, quam se ipse indicasset,

Nep. Paus. 4:

in portis murisque sibimet ipsos tecta coëgerat aedificare,

Liv. 27, 3, 2 (cf. 1. a. supra).—

Ipse stands for the reflexive pronoun,

Where the person or thing referred to is to be emphatically distinguished from others (class.):

cum omnes se expetendos putent, nec id ob aliam rem, sed propter ipsos, necesse est ejus etiam partes propter se expeti, etc.,

Cic. Fin. 5, 17, 46:

quis umquam consul senatum ipsius decretis parere prohibuit?

id. Sest. 14, 32:

quos, quidquid ipsis expediat, facturos arbitrabimur,

id. Fin. 2, 35, 117:

qui negant se recusare, quo minus, ipsis mortuis, terrarum deflagratio consequatur,

id. ib. 3, 19, 64:

nec quid ipsius natura sit intellegit,

id. ib. 5, 9, 24.—

In a subordinate clause, to point out either the subject of the principal clause, or the chief agent or speaker;

esp. where se or sibi is already applied to the subject of the subordinate clause: ne ob eam rem aut suae magnopere virtuti tribueret aut ipsos despiceret,

Caes. B. G. 1, 13, 5:

legatos ad consulem mittit, qui tantum modo ipsi liberisque vitam peterent,

Sall. J. 16, 2; cf.:

ipsis mortuis,

Cic. Fin. 3, 19, 64:

supra nihil, quantum in ipso est, praetermittere quo minus, etc.,

id. Leg. 1, 21, 56:

ipsius,

id. ib. 2, 22, 55:

nihil umquam audivi... nihil de re publica gravius, nihil de ipso modestius, i. e. de ipso dicente,

id. Balb. 1, 2: id quod ipsum adjuvat (i. e. dicentem;

opp. id quod adversario prodest),

id. Inv. 1, 21, 30.—

In gen., for an emphatic se or sibi (mostly post-Aug.; v. Madv. ad Cic. Fin. 3, 12, 40):

nam ipsis certum esse, etc.,

Liv. 35, 46, 13:

pravitas consulum discordiaque inter ipsos,

id. 4, 26, 6:

inexperta remedia haud injuria ipsis esse suspecta,

Curt. 3, 5, 15:

Graecis nuntiare jubet, ipsum quidem gratias agere, etc.,

id. 3, 8, 7:

dixit, ab illo deo ipsos genus ducere,

id. 4, 2, 3:

a quibus nec acceperunt injuriam nec accepisse ipsos existimant, Sen. de Ira, 2, 5, 1: intemperantiam in morbo suam experti parere ipsis vetant,

id. ib. 3, 13, 5:

sciunt ipsos omnia habere communia,

id. Ep. 6, 3; 22, 10 et saep.; cf.:

verum est etiam iis, qui aliquando futuri sint, esse propter ipsos consulendum,

Cic. Fin. 3, 19, 64.—

Ipse stands in free constr. with abl. absol. as with finite verb (cf. also quisque;

only freq. in Liv. and post-Aug. writers): cum dies venit, causa ipse pro se dicta, quindecim milibus aeris damnatur,

Liv. 4, 44, 10 Weissenb. ad loc.:

Romani imperatores, junctis et ipsi exercitibus... ad sedem hostium pervenere,

id. 29, 2, 2:

C. Popilius, dimissis et ipse Atticis navibus... pergit,

id. 45, 10, 2; cf.:

Catilina et Autronius parabant consules interficere, ipsi fascibus conreptis Pisonem cum exercitu mittere,

Sall. C. 18, 5:

amisso et ipse Pacoro,

Tac. G. 37; cf. also the emphatic use of ipse (like quisque) with abl. of gerund (freq. in Liv.):

adsentando indignandoque et ipse,

Liv. 40, 23, 1:

cogendo ipse,

id. 39, 49, 3:

agendo ipse,

id. 41, 24, 2:

aestimando ipse secum,

id. 25, 23, 11 et saep.

Am. prol. 102:

ipsimet nobis,

Cic. Verr. 2, 3, 1, § 3:

ipsemet profugiam,

Sen. Ep. 117, 21; also Front. Aq. 74 ex conj.— Sup.: Com. Ergo ipsusne es? Charm. Ipsissumus, his own very self, Plaut. Trin. 4, 2, 146; cf. Gr. autotatos, Aristoph. Plut. 83; so,

ipsimus and ipsima, for dominus and domina (cf II. A. supra),

Petr. 75, 11; and:

ipsimi nostri,

id. 63, 3 Büch. ex conj.

ipse ( ipsus, Cato, R. R. 70; 71; Plaut. Ps. 4, 7, 43; id. Trin. 2, 2, 40; 3, 1, 10 et saep.; Ter. And. 3, 2, 15; id. Eun. 3, 4, 8, id. Hec. 3, 5, 5; Jusjur. Milit. ap. Gell. 16, 4, 4 al.), a, um (ipsud, Gloss. Philox.); gen. ipsīus ( poet. also ipsĭus, Cat. 64, 43; Verg. A. 1, 114; 2, 772 al.; and dissyl. Ter. Heaut. 3, 3, 15; id. Phorm. 4, 5, 13: ipsi, Afran. ap. Prisc. 694); dat. ipsi (ipso, App. M. 10, p. 243, 24); pron. demonstr. [is - pse for pte; cf. sua-pte and -pote in ut-pote; root in potis; Sanscr. patis, lord, master; hence, = he, the master, himself, etc.; cf. Pott. Etym. Forsch. 2, 866 sq.; Fick, Vergl. Wörterb. p. 116. Hence, in the original form, the pronoun is was declined, while the suffix was unchanged; thus eopte = eo ipso, Paul. ex Fest. p. 110:

eapse = ea ipsa,

id. p. 77; nom. sing. eapse, Plaut. Curc. 1, 3, 4; id. Cist. 1, 2, 17; id. Rud. 2, 3, 80; 2, 5, 21 al.; acc. eumpse, Plaut. Most. 1, 4, 32:

eampse,

Plaut. Aul. 5, 7; id. Cist. 1, 3, 22; id. Men. 5, 2, 22 al.; abl. eopse, Plaut. Curc, 4, 3, 6:

eāpse,

id. Trin. 4, 2, 132; id. Curc. 4, 3, 2; v. Neue, Formenl. 2, 197 sq.], = autos, self, in person, he (emphatic), himself, herself, itself, used both substantively and adjectively, to denote that person (thing) of which something is eminently or exclusively predicated.

In gen.

With substt. or pronn.

Expressing eminence or distinction:

ipse ille Gorgias... in illo ipso Platonis libro,

Cic. de Or. 3, 32, 129:

ille ipse Marcellus,

id. Verr. 2, 2, 2, § 4:

natura ipsa,

id. Brut. 29, 112:

dicet pro me ipsa virtus,

id. Fin. 2, 20, 65:

ipsa res publica,

id. Fam. 3, 11, 3:

neque enim ipse Caesar est alienus a nobis,

id. ib. 6, 10, 2:

ipse Moeris,

Verg. E. 8, 96:

rex ipse Aeneas,

id. A. 1, 575:

ipse aries,

id. E. 3, 95:

ductores ipsi,

id. A. 1, 189:

si in ipsa arce habitarem,

Liv. 2, 7, 10;

esp. freq. with names of gods, etc.: naturas quas Juppiter ipse Addidit,

Verg. G. 4, 149; id. A. 3, 222; Hor. C. 1, 16, 12:

Pater ipse,

Verg. G. 1, 121; Tib. 1, 4, 23:

Venus ipsa,

Hor. C. 2, 8, 13; Ov. H. 19, 159:

ipse pater Pluton,

Verg. A. 7, 327 et saep.—Prov.:

audentes deus ipse juvat,

Ov. M. 10, 586.—

For emphasis or in contrast, very, just, precisely, self, in person:

adest optime ipse frater,

Ter. Eun. 5, 2, 66:

in orationibus hisce ipsis,

Cic. de Or. 1, 16, 73:

ea ipsa hora,

id. Fam. 7, 23, 4:

nec carmina nobis Ipsa placent: ipsae rursus concedite silvae,

Verg. E. 10, 63:

tute ipse his rebus finem praescripsti,

Ter. And. 1, 1, 124:

lepide ipsi hi sunt capti,

Plaut. Bacch. 5, 2, 91:

ego enim ipse cum eodem isto non invitus erraverim,

Cic. Tusc. 1, 17, 40:

ipse ille divinationis auctor,

id. Div. 2, 28, 61:

cariorem esse patriam quam nosmet ipsos,

id. Fin. 3, 19, 64:

eaque ipsa causa belli fuit,

the very, the true cause, Liv. 1, 57, 1; esp. with is, in all persons and numbers:

estne hic Philto? Is hercle'st ipsus,

Plaut. Trin. 2, 4, 31:

cui tutor is fuerat ipse,

Liv. 5, 33, 3:

jam id ipsum absurdum, maximum malum neglegi,

even, Cic. Fin. 2, 28, 93 (Madv.); id. de Or. 2, 30, 132:

tempus ad id ipsum congruere,

Liv. 1, 5, 5:

duum vir ad id ipsum creatus,

id. 2, 42, 5:

Tullius et eos ipsos et per eos multitudinem aliam deduxit,

id. 2, 38, 1:

eorum ipsorum facta (opp. loca in quibus, etc.),

Cic. Fin. 5, 1, 2:

nec vero clarorum virorum post mortem honores permanerent, si nihil eorum ipsorum animi efficerent,

id. de Sen. 22, 80:

ad eum ipsum honorem deferre,

Liv. 3, 51, 3; so sometimes with an inf. or subst.-clause:

ipsum dicere ineptum,

Cic. de Or. 1, 24, 112:

quid juvat quod ante initum tribunatum veni, si ipsum, quod veni, nihil juvat?

the mere fact, the fact alone, id. Att. 11, 9, 1:

ipsum, quod habuisti,

Sen. Cons. ad Marc. 12, 2:

et ipsum, quod sum victus, ama,

Luc. 8, 78.— Esp. in legal phrase: ipso jure, by the letter of the law, in legal strictness or precision, Gai Inst. 2, 198; 3, 181; 4, 106 sqq. et saep.—

Alone, emphatically taking the place of an omitted person. or demonstr. pron.: Ar. Ubi is nunc est? He. Ubi ego minume atque ipsus se volt maxume, Plaut. Capt. 3, 4, 108; 4, 1, 10: Su. Is ipsusne's? Ch. Aio: Su. Ipsus es? id. Trin. 4, 2, 146:

atque ipsis, ad quorum commodum pertinebat, durior inventus est Coelius,

Caes. B. C. 3, 20, 4:

quaeram ex ipsā,

Cic. Cael. 14:

tempus, quo ipse eos sustulisset, ad id ipsum congruere,

Liv. 1, 5, 5:

agrum dare immunem ipsi, qui accepisset, liberisque,

id. 21, 45, 5; 9, 34, 18; 10, [p. 999] 6, 10:

laeta et ipsis qui rem gessere expugnatio fuit,

id. 28, 4, 1:

a nobis exposita, ut ab ipsis, qui eam disciplinam probant,

Cic. Fin. 1, 5, 13.—So freq. in Cic. before a rel.:

ut de ipso, qui judicarit, judicium fieri videretur,

Cic. Inv. 1, 44, 82:

ipsi omnia, quorum negotium est, ad nos deferunt,

id. de Or. 1, 58, 250; 2, 14, 60; id. Div. in Caecil. 4, 13; v. Madv. ad Cic. Fin. 2, 28, 93:

nullis definitionibus utuntur, ipsique dicunt ea se modo probare, quibus natura tacita assentiatur,

Cic. Fin. 3, 12, 40 Madv. —

To make prominent one of two or more subjects of any predicate, he ( she, il), for his part, he too, also, as well.

Ipse alone:

litterae Metello Capuam adlatae sunt a Clodia, quae ipsa transiit,

i. e. also, in person, Cic. Att. 9, 6, 3:

Italiam ornare quam domum suam maluit: quamquam Italia ornata domus ipsa mihi videtur ornatior,

id. Off. 2, 22, 76:

tris ipse excitavit recitatores,

he too, id. Clu. 51, 141:

neque tanti timoris sum ut ipse deficiam,

Caes. B. C. 2, 31, 8:

Jugurtha, tametsi regem ficta locutum intellegebat, et ipse longe aliter animo agitabat,

Sall. J. 11, 1:

hoc Rhipeus, hoc ipse Dymas omnisque juventus Laeta facit,

Verg. A. 2, 394.—

With conjunctions.

With etiam (class.):

ipse etiam Fufidius in numero fuit,

Cic. Brut. 29, 112: scribebat orationes quas alii dicerent: quamquam is etiam ipse scripsit eas, quibus pro se est usus, sed non sine Aelio;

his enim scriptis etiam ipse interfui,

id. ib. 56, 206 sq. —

With quoque:

quippe quia plebs senatus consultum solvit, ipsi quoque solutum vultis,

Liv. 3, 21, 4:

consul, quia collegae decretum triumphum audivit, ipse quoque triumphi flagitator Romam rediit,

id. 8, 12, 9:

cum subito Sulpicius et Albinovanus objecissent catervas, ipse quoque (Sulla) jaculatus, etc.,

Flor. 3, 21, 7.—

With et (et ipse = kai autos, ipse etiam; rare in Cic.; cf.

Zumpt, Gram. § 698): tamen et ipsi tuae familiae genere et nomine continebuntur,

Cic. Caecin. 20, 58:

deseret eos quos una scis esse, cum habeat praesertim et ipse cohortis triginta?

id. Att. 8, 7, 1; id. de Or. 1, 46, 202:

Cornelius dictatorem Aemilium dixit, et ipse ab eo magister equitum est dictus,

Liv. 4, 31, 5:

credo ego vos, socii, et ipsos cernere,

id. 21, 21, 3:

Cornelio minus copiarum datum, quia L. Manlius praetor et ipse cum praesidio in Galliam mittebatur,

id. 21, 17, 7:

qui et ipse crus fregerat,

Suet. Aug. 43:

Antoninus Commodus nihil paternum habuit, nisi quod contra Germanos feliciter et ipse pugnavit,

Eutr. 8, 7:

virtutes et ipsae taedium pariunt,

Quint. 9, 4, 43. —

With nec ( = ne ipse quidem):

primis repulsis Maharbal cum majore robore virorum missus nec ipse eruptionem cohortium sustinuit,

Liv. 23, 18, 4:

nihil moveri viderunt, nec ipsi quicquam mutarunt,

id. 37, 20, 8:

neque ipsi,

id. 30, 42, 7: crimina non quidem nec ipsa mediocria;

sed quid ista sunt prae iis, etc.,

id. 34, 32, 9.

Esp.

By way of eminence, ipse is used to indicate the chief person, host, master, teacher, etc.:

ipsa, the mistress, etc.: ipsus tristis,

Ter. And. 2, 2, 23:

ipsum praesto video,

id. ib. 2, 5, 3:

ego eo quo me ipsa misit,

Plaut. Cas. 4, 2, 10:

suam norat ipsam tam bene, quam puella matrem,

Cat. 3, 7 (Müll., ipsa); cf.:

Pythagorei respondere solebant, ipse dixit,

i. e. Pythagoras, Cic. N. D. 1, 5, 10; cf.:

nec hoc oratori contingere inter adversarios quod Pythagorae inter discipulos potest ipse dixit,

Quint. 11, 1, 27:

cum veniat lectica Mathonis plena ipso,

the great man, Juv. 1, 33:

anseris ante ipsum jecur,

before the host, id. 5, 114.—

Of or by one ' s self, of one ' s own accord = suā sponte, ultro:

videar non ipse promisisse (opp. to fortuito),

Cic. de Or. 1, 24, 111:

de manibus delapsa arma ipsa ceciderunt,

id. Off. 1, 22, 77:

valvae clausae se ipsae aperuerunt,

id. Div. 1, 37, 74:

ipsae lacte domum referent distenta capellae Ubera,

Verg. E. 4, 21:

ipsi potum venient juvenci,

id. ib. 7, 11; cf.:

aliae ipsae Sponte sua veniunt,

id. G. 2, 10:

fruges sponte sua (tellus) primum ipsa creavit,

Lucr. 2, 11, 58; and autai for automatoi, Theocr. Idyll. 11, 12.—

Himself exclusively.

By or in one ' s self, alone:

haec ipse suo tristi cum corde volutat,

Verg. A. 6, 185:

his actis, aliud genitor secum ipse volutat,

id. ib. 12, 843: tempus secum ipsa Exigit, id. ib. 4, 475:

quam facile exercitu soclos conservaturus sit, qui ipso nomine ac rumore defenderit,

Cic. de Imp. Pomp. 15, 45:

multa secum ipse volvens,

Sall. C. 32, 1:

aestimando ipse secum,

Liv. 25, 23, 11.—

In one ' s self, for one ' s own sake:

ipsam aequitatem et jus ipsum amare,

Cic. Leg. 1, 18, 48.—

Of one ' s self, of one ' s own nature, etc.:

erat ipse immani acerbāque naturā Oppianicus,

Cic. Clu. 15, 44:

duo imperatores, ipsi pares, ceterum opibus disparibus,

Sall. J. 52, 1:

natura serpentium, ipsa perniciosa, siti accenditur,

id. ib. 89, 5.—

With advv. of time.

Nunc ipsum, just now, at this very time:

nunc ipsum exurit,

Plaut. Bacch. 4, 9, 16:

nunc ipsum non dubitabo rem tantam adicere,

Cic. Att. 7, 3, 2; 8, 9, 2:

nunc tamen ipsum sine te esse non possum,

id. ib. 12, 16. —

Tum ipsum, just then, at that very time:

id, quod aliquando posset accidere, ne tum ipsum accideret, timere,

Cic. de Or. 1, 27, 124:

ratio largitionum vitiosa est, temporibus necessaria, et tum ipsum ad facultates accommodanda est,

id. Off. 2, 17, 60:

et tum ipsum, cum immolare velis, extorum fieri mutatio potest,

id. Div. 1, 52, 118; cf. id. Fin. 2, 20, 65 Madv.—

With numerals, just, exactly, precisely (opp. fere):

triginta dies erant ipsi, cum, etc.,

Cic. Att. 3, 21 init.:

ipsas undecim esse legiones,

id. Fam. 6, 18, 2:

nam cum dixisset minus 1000 (sc. milia), populus cum risu acclamavit, ipsa esse,

id. Caecin. 10, 28; cf. id. Brut. 15, 61; 43, 162:

ipso vigesimo anno,

id. Verr. 2, 2, 9, § 25. —

In reflexive uses,

Ipse strengthens the subject when opposed in thought to other agents; the object, when opposed to other objects; cf. Zumpt, Gram. § 696; Kennedy, Gram. § 67, 3; Madv. Gram. § 487, 6. — Hence,

With subject.

In gen.:

non egeo medicina (i. e. ut alii me consolentur), me ipse consolor,

Cic. Lael. 3, 10:

Junius necem sibi ipse conscivit,

id. N. D. 2, 3, 7:

neque potest exercitum is continere imperator, qui se ipse non continet,

id. de Imp. Pomp. 13, 38:

Artaxerxes se ipse reprehendit,

Nep. Dat. 5:

ipsa se virtus satis ostendit,

Sall. J. 85; cf.:

deponendo tutelam ipse in se unum omnium vires convertit,

Liv. 24, 4, 9:

deforme etiam est de se ipsum praedicare,

Cic. Off. 1, 38, 137.—

With special emphasis, ipse is joined to the subject to indicate its relation to itself as both subject and object, though the antithesis would suggest another case (Cic.):

cum iste sic erat humilis atque demissus, ut non modo populo Romano, sed etiam sibi ipse condemnatus videretur,

Cic. Verr. 1, 6, 17:

si quis ipse sibi inimicus est,

id. Fin. 5, 10, 28:

qui ipsi sibi bellum indixissent,

id. ib. 5, 10, 29:

quoniam se ipsi omnes natura diligant,

id. ib. 3, 18, 59:

nam si ex scriptis cognosci ipsi suis potuissent,

id. de Or. 2, 2, 8.—

With object:

neque vero ipsam amicitiam tueri (possumus), nisi aeque amicos et nosmet ipsos diligamus,

Cic. Fin. 1, 20, 67:

omne animal se ipsum diligit,

id. ib. 5, 9, 24:

fac ut diligentissime te ipsum custodias,

id. Fam. 9, 14, 8:

Pompeianus miles fratrem suum, dein se ipsum interfecit,

Tac. H. 3, 51:

Lentulum, quem mihi ipsi antepono,

Cic. Fam. 3, 7, 5.—

Ipse defines the subject of a reflexive pronoun:

natura movet infantem, sed tantum ut se ipse diligat (where ipse shows that se refers to infantem),

Cic. Fin. 2, 10, 33: proinde consulant sibi ipsi;

jubeant abire se,

Just. 16, 4, 15:

neque prius vim adhibendam putaverunt, quam se ipse indicasset,

Nep. Paus. 4:

in portis murisque sibimet ipsos tecta coëgerat aedificare,

Liv. 27, 3, 2 (cf. 1. a. supra).—

Ipse stands for the reflexive pronoun,

Where the person or thing referred to is to be emphatically distinguished from others (class.):

cum omnes se expetendos putent, nec id ob aliam rem, sed propter ipsos, necesse est ejus etiam partes propter se expeti, etc.,

Cic. Fin. 5, 17, 46:

quis umquam consul senatum ipsius decretis parere prohibuit?

id. Sest. 14, 32:

quos, quidquid ipsis expediat, facturos arbitrabimur,

id. Fin. 2, 35, 117:

qui negant se recusare, quo minus, ipsis mortuis, terrarum deflagratio consequatur,

id. ib. 3, 19, 64:

nec quid ipsius natura sit intellegit,

id. ib. 5, 9, 24.—

In a subordinate clause, to point out either the subject of the principal clause, or the chief agent or speaker;

esp. where se or sibi is already applied to the subject of the subordinate clause: ne ob eam rem aut suae magnopere virtuti tribueret aut ipsos despiceret,

Caes. B. G. 1, 13, 5:

legatos ad consulem mittit, qui tantum modo ipsi liberisque vitam peterent,

Sall. J. 16, 2; cf.:

ipsis mortuis,

Cic. Fin. 3, 19, 64:

supra nihil, quantum in ipso est, praetermittere quo minus, etc.,

id. Leg. 1, 21, 56:

ipsius,

id. ib. 2, 22, 55:

nihil umquam audivi... nihil de re publica gravius, nihil de ipso modestius, i. e. de ipso dicente,

id. Balb. 1, 2: id quod ipsum adjuvat (i. e. dicentem;

opp. id quod adversario prodest),

id. Inv. 1, 21, 30.—

In gen., for an emphatic se or sibi (mostly post-Aug.; v. Madv. ad Cic. Fin. 3, 12, 40):

nam ipsis certum esse, etc.,

Liv. 35, 46, 13:

pravitas consulum discordiaque inter ipsos,

id. 4, 26, 6:

inexperta remedia haud injuria ipsis esse suspecta,

Curt. 3, 5, 15:

Graecis nuntiare jubet, ipsum quidem gratias agere, etc.,

id. 3, 8, 7:

dixit, ab illo deo ipsos genus ducere,

id. 4, 2, 3:

a quibus nec acceperunt injuriam nec accepisse ipsos existimant, Sen. de Ira, 2, 5, 1: intemperantiam in morbo suam experti parere ipsis vetant,

id. ib. 3, 13, 5:

sciunt ipsos omnia habere communia,

id. Ep. 6, 3; 22, 10 et saep.; cf.:

verum est etiam iis, qui aliquando futuri sint, esse propter ipsos consulendum,

Cic. Fin. 3, 19, 64.—

Ipse stands in free constr. with abl. absol. as with finite verb (cf. also quisque;

only freq. in Liv. and post-Aug. writers): cum dies venit, causa ipse pro se dicta, quindecim milibus aeris damnatur,

Liv. 4, 44, 10 Weissenb. ad loc.:

Romani imperatores, junctis et ipsi exercitibus... ad sedem hostium pervenere,

id. 29, 2, 2:

C. Popilius, dimissis et ipse Atticis navibus... pergit,

id. 45, 10, 2; cf.:

Catilina et Autronius parabant consules interficere, ipsi fascibus conreptis Pisonem cum exercitu mittere,

Sall. C. 18, 5:

amisso et ipse Pacoro,

Tac. G. 37; cf. also the emphatic use of ipse (like quisque) with abl. of gerund (freq. in Liv.):

adsentando indignandoque et ipse,

Liv. 40, 23, 1:

cogendo ipse,

id. 39, 49, 3:

agendo ipse,

id. 41, 24, 2:

aestimando ipse secum,

id. 25, 23, 11 et saep.

Am. prol. 102:

ipsimet nobis,

Cic. Verr. 2, 3, 1, § 3:

ipsemet profugiam,

Sen. Ep. 117, 21; also Front. Aq. 74 ex conj.— Sup.: Com. Ergo ipsusne es? Charm. Ipsissumus, his own very self, Plaut. Trin. 4, 2, 146; cf. Gr. autotatos, Aristoph. Plut. 83; so,

ipsimus and ipsima, for dominus and domina (cf II. A. supra),

Petr. 75, 11; and:

ipsimi nostri,

id. 63, 3 Büch. ex conj.

   The 1976 Constitution and 1982 revisions provide for three fundamental courts, each with different functions, as well as other special courts, including a military court. The three principal courts are the Constitutional Court, Supreme Court of Justice, and Supreme Court of Administration. The Constitutional Court determines whether legislative acts (laws) are legal and constitutional. In addition, it ascertains the physical ability of the president of the Republic to perform duties of office, as well as to determine the constitutionality of international agreements. Ten of this court's members are selected by the Assembly of the Republic.

   The Supreme Court of Justice, the highest court of law, heads the court system and tries civil and criminal cases. It includes first courts to try cases and courts of appeal. The Supreme Court of Administration examines the administrative and fiscal conduct of government institutions. All matters concerning judges, including the power to discipline judges whose conduct does not comply with the law, are overseen by the Higher Council of the Bench and the Superior Council of the Administrative and Fiscal Courts. There is also an Ombudsman, elected for a four-year term by the Assembly of the Republic, who serves as chief civil and human rights officer of the country. This officer receives 3,000-4,000 complaints a year from citizens who dispute acts of the judicial and legal system.

   Portugal's system of laws is based on Roman civil law and has been shaped by the French legal system. Unlike common law in the American and British legal systems, Portugal's system of laws is based on a complete body of law so that judicial reason is deductive. Legal precedent, then, has little influence. Portuguese judges are viewed as civil servants simply applying the law from codes, not as a judiciary who interpret law. While the post-1974 judicial and legal system is freer and fairer than that under the Estado Novo dictatorship, it has received criticism on the grounds of being very slow, cumbersome, overburdened with cases, and sometimes corrupt. There has been a backlog of untried cases and long delays before trial because of vacant judgeships and inefficient operations.

   Under Portuguese criminal law, preventive detention for a maximum of four months is legal. Much longer preventive detention terms occur due to the trial backlog. Memories persist of legal abuses under the Estado Novo system, when suspects convicted of crimes against the state could be detained legally for periods of from six months to three years. Media sensationalism and the cited problems of the judicial system exacerbated tensions in recent high-profile trials, including the 2004-05 trial of a child prostitution and pedophile ring, tried in Lisbon, with suspects including a celebrated television personality and a former diplomat.

SUBJECT AREA: Electricity, Public utilities

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Brush graduated from the University of Michigan in 1869 and worked for several years as a chemist. Believing that electric arc lighting would be commercially successful if the equipment could be improved, he completed his first dynamo in 1875 and a simplified arc lamp. His original system operated a maximum of four lights, each on a separate circuit, from one dynamo. Brush envisaged a wider market for his product and by 1879 had available on arc lighting system principally intended for street and other outdoor illumination. He designed a dynamo that generated a high voltage and which, with a carbon-pile regulator, provided an almost constant current permitting the use of up to forty lamps on one circuit. He also improved arc lamps by incorporating a slipping-clutch regulating mechanism and automatic means of bringing into use a second set of carbons, thereby doubling the period between replacements.

Brush's multiple electric arc lighting system was first demonstrated in Cleveland and by 1880 had been adopted in a number of American cities, including New York, Boston and Philadelphia. It was also employed in many European towns until incandescent lamps, for which the Brush dynamo was unsuitable, came into use. To market his apparatus, Brush promoted local lighting companies and thereby secured local capital.

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See also: Hammond, Robert

SUBJECT AREA: Land transport, Railways and locomotives

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Gresley was the son of the Rector of Netherseale, Derbyshire; he was educated at Marlborough and by the age of 13 was skilled at making sketches of locomotives. In 1893 he became a pupil of F.W. Webb at Crewe works, London \& North Western Railway, and in 1898 he moved to Horwich works, Lancashire \& Yorkshire Railway, to gain drawing-office experience under J.A.F.Aspinall, subsequently becoming Foreman of the locomotive running sheds at Blackpool. In 1900 he transferred to the carriage and wagon department, and in 1904 he had risen to become its Assistant Superintendent. In 1905 he moved to the Great Northern Railway, becoming Superintendent of its carriage and wagon department at Doncaster under H.A. Ivatt. In 1906 he designed and produced a bogie luggage van with steel underframe, teak body, elliptical roof, bowed ends and buckeye couplings: this became the prototype for East Coast main-line coaches built over the next thirty-five years. In 1911 Gresley succeeded Ivatt as Locomotive, Carriage \& Wagon Superintendent. His first locomotive was a mixed-traffic 2–6–0, his next a 2–8–0 for freight. From 1915 he worked on the design of a 4–6–2 locomotive for express passenger traffic: as with Ivatt's 4 4 2s, the trailing axle would allow the wide firebox needed for Yorkshire coal. He also devised a means by which two sets of valve gear could operate the valves on a three-cylinder locomotive and applied it for the first time on a 2–8–0 built in 1918. The system was complex, but a later simplified form was used on all subsequent Gresley three-cylinder locomotives, including his first 4–6–2 which appeared in 1922. In 1921, Gresley introduced the first British restaurant car with electric cooking facilities.

With the grouping of 1923, the Great Northern Railway was absorbed into the London \& North Eastern Railway and Gresley was appointed Chief Mechanical Engineer. More 4–6– 2s were built, the first British class of such wheel arrangement. Modifications to their valve gear, along lines developed by G.J. Churchward, reduced their coal consumption sufficiently to enable them to run non-stop between London and Edinburgh. So that enginemen might change over en route, some of the locomotives were equipped with corridor tenders from 1928. The design was steadily improved in detail, and by comparison an experimental 4–6–4 with a watertube boiler that Gresley produced in 1929 showed no overall benefit. A successful high-powered 2–8–2 was built in 1934, following the introduction of third-class sleeping cars, to haul 500-ton passenger trains between Edinburgh and Aberdeen.

In 1932 the need to meet increasing road competition had resulted in the end of a long-standing agreement between East Coast and West Coast railways, that train journeys between London and Edinburgh by either route should be scheduled to take 8 1/4 hours. Seeking to accelerate train services, Gresley studied high-speed, diesel-electric railcars in Germany and petrol-electric railcars in France. He considered them for the London \& North Eastern Railway, but a test run by a train hauled by one of his 4–6–2s in 1934, which reached 108 mph (174 km/h), suggested that a steam train could better the railcar proposals while its accommodation would be more comfortable. To celebrate the Silver Jubilee of King George V, a high-speed, streamlined train between London and Newcastle upon Tyne was proposed, the first such train in Britain. An improved 4–6–2, the A4 class, was designed with modifications to ensure free running and an ample reserve of power up hill. Its streamlined outline included a wedge-shaped front which reduced wind resistance and helped to lift the exhaust dear of the cab windows at speed. The first locomotive of the class, named Silver Link, ran at an average speed of 100 mph (161 km/h) for 43 miles (69 km), with a maximum speed of 112 1/2 mph (181 km/h), on a seven-coach test train on 27 September 1935: the locomotive went into service hauling the Silver Jubilee express single-handed (since others of the class had still to be completed) for the first three weeks, a round trip of 536 miles (863 km) daily, much of it at 90 mph (145 km/h), without any mechanical troubles at all. Coaches for the Silver Jubilee had teak-framed, steel-panelled bodies on all-steel, welded underframes; windows were double glazed; and there was a pressure ventilation/heating system. Comparable trains were introduced between London Kings Cross and Edinburgh in 1937 and to Leeds in 1938.

Gresley did not hesitate to incorporate outstanding features from elsewhere into his locomotive designs and was well aware of the work of André Chapelon in France. Four A4s built in 1938 were equipped with Kylchap twin blast-pipes and double chimneys to improve performance still further. The first of these to be completed, no. 4468, Mallard, on 3 July 1938 ran a test train at over 120 mph (193 km/h) for 2 miles (3.2 km) and momentarily achieved 126 mph (203 km/h), the world speed record for steam traction. J.Duddington was the driver and T.Bray the fireman. The use of high-speed trains came to an end with the Second World War. The A4s were then demonstrated to be powerful as well as fast: one was noted hauling a 730-ton, 22-coach train at an average speed exceeding 75 mph (120 km/h) over 30 miles (48 km). The war also halted electrification of the Manchester-Sheffield line, on the 1,500 volt DC overhead system; however, anticipating eventual resumption, Gresley had a prototype main-line Bo-Bo electric locomotive built in 1941. Sadly, Gresley died from a heart attack while still in office.

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See also: Bulleid, Oliver Vaughan Snell

SUBJECT AREA: Electricity, Electronics and information technology, Public utilities

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After attending Owens College, Manchester, Hopkinson was admitted to Trinity College, Cambridge, in 1867 to read for the Mathematical Tripos. An appointment in 1872 with the lighthouse department of the Chance Optical Works in Birmingham directed his attention to electrical engineering. His most noteworthy contribution to lighthouse engineering was an optical system to produce flashing lights that distinguished between individual beacons. His extensive researches on the dielectric properties of glass were recognized when he was elected to a Fellowship of the Royal Society at the age of 29. Moving to London in 1877 he became established as a consulting engineer at a time when electricity supply was about to begin on a commercial scale. During the remainder of his life, Hopkinson's researches resulted in fundamental contributions to electrical engineering practice, dynamo design and alternating current machine theory. In making a critical study of the Edison dynamo he developed the principle of the magnetic circuit, a concept also arrived at by Gisbert Kapp around the same time. Hopkinson's improvement of the Edison dynamo by reducing the length of the field magnets almost doubled its output. In 1890, in addition to-his consulting practice, Hopkinson accepted a post as the first Professor of Electrical Engineering and Head of the Siemens laboratory recently established at King's College, London. Although he was not involved in lecturing, the position gave him the necessary facilities and staff and student assistance to continue his researches. Hopkinson was consulted on many proposals for electric traction and electricity supply, including schemes in London, Manchester, Liverpool and Leeds. He also advised Mather and Platt when they were acting as contractors for the locomotives and generating plant for the City and South London tube railway. As early as 1882 he considered that an ideal method of charging for the supply of electricity should be based on a two-part tariff, with a charge related to maximum demand together with a charge for energy supplied. Hopkinson was one the foremost expert witnesses of his day in patent actions and was himself the patentee of over forty inventions, of which the three-wire system of distribution and the series-parallel connection of traction motors were his most successful. Jointly with his brother Edward, John Hopkinson communicated the outcome of his investigations to the Royal Society in a paper entitled "Dynamo Electric Machinery" in 1886. In this he also described the later widely used "back to back" test for determining the characteristics of two identical machines. His interest in electrical machines led him to more fundamental research on magnetic materials, including the phenomenon of recalescence and the disappearance of magnetism at a well-defined temperature. For his work on the magnetic properties of iron, in 1890 he was awarded the Royal Society Royal Medal. He was a member of the Alpine Club and a pioneer of rock climbing in Britain; he died, together with three of his children, in a climbing accident.

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SUBJECT AREA: Aerospace, Electronics and information technology, Telecommunications

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From his high-school days, Pierce showed an interest in science and in science fiction, writing under the pseudonym of J.J.Coupling. After gaining Bachelor's, Master's and PhD degrees at the California Institute of Technology (CalTech) in Pasadena in 1933, 1934 and 1936, respectively, Pierce joined the Bell Telephone Laboratories in New York City in 1936. There he worked on improvements to the travelling-wave tube, in which the passage of a beam of electrons through a helical transmission line at around 7 per cent of the speed of light was made to provide amplification at 860 MHz. He also devised a new form of electrostatically focused electron-multiplier which formed the basis of a sensitive detector of radiation. However, his main contribution to electronics at this time was the invention of the Pierce electron gun—a method of producing a high-density electron beam. In the Second World War he worked with McNally and Shepherd on the development of a low-voltage reflex klystron oscillator that was applied to military radar equipment.

In 1952 he became Director of Electronic Research at the Bell Laboratories' establishment, Murray Hill, New Jersey. Within two years he had begun work on the possibility of round-the-world relay of signals by means of communication satellites, an idea anticipated in his early science-fiction writings (and by Arthur C. Clarke in 1945), and in 1955 he published a paper in which he examined various possibilities for communications satellites, including passive and active satellites in synchronous and non-synchronous orbits. In 1960 he used the National Aeronautics and Space Administration 30 m (98 1/2 ft) diameter, aluminium-coated Echo 1 balloon satellite to reflect telephone signals back to earth. The success of this led to the launching in 1962 of the first active relay satellite (Telstar), which weighed 170 lb (77 kg) and contained solar-powered rechargeable batteries, 1,000 transistors and a travelling-wave tube capable of amplifying the signal 10,000 times. With a maximum orbital height of 3,500 miles (5,600 km), this enabled a variety of signals, including full bandwidth television, to be relayed from the USA to large receiving dishes in Europe.

From 1971 until his "retirement" in 1979, Pierce was Professor of Electrical Engineering at CalTech, after which he became Chief Technologist at the Jet Propulsion Laboratories, also in Pasadena, and Emeritus Professor of Engineering at Stanford University.

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SUBJECT AREA: Medical technology

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He qualified at St Bartholomew's Hospital in 1938 and after early hospital posts served in the Army as a specialist in pathology in West Africa and Singapore. In 1947 he joined the Medical Research Council (MRC) and until 1957 he was involved with the Pneumoconiosis Research Unit in investigation of dust inhalation. In 1957 he transferred to the National Institute for Medical Research, to concentrate on instrument development, and in 1969 to the Bioengineering Division of the MRC Clinical Research Centre at Northwick Park Hospital. He was responsible for a number of instrumental developments and inventions in the fields, amongst others, of respiration measurement, blood alcohol levels and variable adjustable spectacle lenses (achieved by altering the curvature of the surface of a thinwalled transparent fluid cell).

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