construction foreman

mestre-de-obras

maestro de obras.

— armament maintenance foreman

— construction foreman

SUBJECT AREA: Land transport, Mining and extraction technology, Railways and locomotives

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The Wylam wagonway passed Newburn, and Hedley, who went to school at Wylam, must have been familiar with this wagonway from childhood. It had been built c.1748 to carry coal from Wylam Colliery to the navigable limit of the Tyne at Lemington. In 1805 Hedley was appointed viewer, or manager, of Wylam Colliery by Christopher Blackett, who had inherited the colliery and wagonway in 1800. Unlike most Tyneside wagonways, the gradient of the Wylam line was insufficient for loaded wagons to run down by gravity and they had to be hauled by horses. Blackett had a locomotive, of the type designed by Richard Trevithick, built at Gateshead as early as 1804 but did not take delivery, probably because his wooden track was not strong enough. In 1808 Blackett and Hedley relaid the wagonway with plate rails of the type promoted by Benjamin Outram, and in 1812, following successful introduction of locomotives at Middleton by John Blenkinsop, Blackett asked Hedley to investigate the feasibility of locomotives at Wylam. The expense of re-laying with rack rails was unwelcome, and Hedley experimented to find out the relationship between the weight of a locomotive and the load it could move relying on its adhesion weight alone. He used first a model test carriage, which survives at the Science Museum, London, and then used a full-sized test carriage laden with weights in varying quantities and propelled by men turning handles. Having apparently satisfied himself on this point, he had a locomotive incorporating the frames and wheels of the test carriage built. The work was done at Wylam by Thomas Waters, who was familiar with the 1804 locomotive, Timothy Hackworth, foreman smith, and Jonathan Forster, enginewright. This locomotive, with cast-iron boiler and single cylinder, was unsatisfactory: Hackworth and Forster then built another locomotive to Hedley's design, with a wrought-iron return-tube boiler, two vertical external cylinders and drive via overhead beams through pinions to the two axles. This locomotive probably came into use in the spring of 1814: it performed well and further examples of the type were built. Their axle loading, however, was too great for the track and from about 1815 each locomotive was mounted on two four-wheeled bogies, the bogie having recently been invented by William Chapman. Hedley eventually left Wylam in 1827 to devote himself to other colliery interests. He supported the construction of the Clarence Railway, opened in 1833, and sent his coal over it in trains hauled by his own locomotives. Two of his Wylam locomotives survive— Puffing Billy at the Science Museum, London, and Wylam Dilly at the Royal Museum of Scotland, Edinburgh—though how much of these is original and how much dates from the period 1827–32, when the Wylam line was re-laid with edge rails and the locomotives reverted to four wheels (with flanges), is a matter of mild controversy.

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See also: Stephenson, George

1) (in or to a position lower than, or covered by: Your pencil is under the chair; Strange plants grow under the sea.) debajo, bajo

2) (less than, or lower in rank than: Children under five should not cross the street alone; You can do the job in under an hour.) menor de, (de) menos de

3) (subject to the authority of: As a foreman, he has about fifty workers under him.) a las órdenes (de)

4) (used to express various states: The fort was under attack; The business improved under the new management; The matter is under consideration/discussion.) bajo

- under-

under¹ adv menos

under² prep

1. bajo / debajo de

2. menos de

3. menor de

4. bajo

tr['ʌndə^SMALLr/SMALL]

preposition

1 (below) bajo, debajo de

■ it's under the bed está debajo de la cama

■ the tunnel goes under the Channel el túnel pasa por debajo del Canal de la Mancha

2 (less than) menos de

■ he earns under fifteen thousand pounds a year gana menos de quince mil libras al año

■ he looks under eighteen to me a mi me parece que tiene menos de dieciocho años

■ there was nobody under the age of sixty no había nadie con menos de sesenta años

3 (controlled, affected, influenced by) bajo

■ dancing was banned under Cromwell bajo Cromwell estaba prohibido bailar

■ she was born under Cancer nació bajo el signo de Cáncer

4 (suffering, subject to) bajo

■ he's under arrest está detenido, está bajo arresto

■ under anaesthetic bajo anestesia

■ he is under a lot of pressure está sometido a muchas presiones

■ we are under attack nos están atacando

■ the ports are under blockade los puertos están sometidos a bloqueo

5 (according to) conforme a, según

■ under the terms of the agreement según los términos del acuerdo

6 (known by) con, bajo

■ she worked under a false name trabajó con un nombre falso

adverb

1 (below) debajo

■ he fell into the river and was under for over a minute cayó al río y estuvo bajo el agua durante más de un minuto

2 (less) menos

■ we have a wide range of watches for £30 or under tenemos una amplia gama de relojes por treinta libras o menos

\

to be under age ser menor de edad

to be under cover (protected) estar a cubierto 2 (in hiding) estar en la clandestinidad

to be under lock and key estar bajo llave

to be under repair estar en reparación, estar reparándose

to be under the doctor estar en manos del médico

to be under the impression that... tener la impresión de que...

to go under estrellarse, irse a pique

under the circumstances... dadas la circunstancias...

under ['ʌndər] adv

1) less: menos

$10 or under: $10 o menos

2) underwater: debajo del agua

3) : bajo los efectos de la anestesia

under adj

1) lower: (más) bajo, inferior

2) subordinate: inferior

3) : insuficiente

an under dose of medicine: una dosis insuficiente de medicina

under prep

1) below, beneath: debajo de, abajo de

under the table: abajo de la mesa

we walked under the arch: pasamos por debajo del arco

under the sun: bajo el sol

2) : menos de

in under 20 minutes: en menos de 20 minutos

3) (indicating rank or authority) : bajo

under the command of: bajo las órdenes de

4) subject to: bajo

under suspicion: bajo sospecha

under the circumstances: dadas las circunstancias

5) according to: según, de acuerdo con, conforme a

under the present laws: según las leyes actuales

• bajero, -a adj.

• inferior adj.

• interior adj.

• abajo adv.

• bajo adv.

• debajo adv.

• debajo de adv.

• más abajo adv.

• bajo prep.

• debajo de prep.

• inferior a prep.

1) ( beneath) debajo de, abajo de (AmL)

2) ( less than) menos de

3) \<\<name/heading\>\> bajo

4)

a) \<\<government/authority\>\> bajo

b) ( subject to)

5) ( according to) según

1)

a) ( under water)

b) ( anesthetized)

2) ( less) menos

1. ADV

1) (=beneath) (position) debajo; (direction) abajo

2) * (=under anaesthetic)

3) (=less) menos

2. PREP

1) (=beneath) debajo de

2) (=less than) menos de

3) (=subject to) bajo

4) (with names)

5) (=according to, by) de acuerdo con, según

6) (Agr)

* * *

1) ( beneath) debajo de, abajo de (AmL)

2) ( less than) menos de

3) \<\<name/heading\>\> bajo

4)

a) \<\<government/authority\>\> bajo

b) ( subject to)

5) ( according to) según

1)

a) ( under water)

b) ( anesthetized)

2) ( less) menos

1) (in or to a position lower than, or covered by: Your pencil is under the chair; Strange plants grow under the sea.) under

2) (less than, or lower in rank than: Children under five should not cross the street alone; You can do the job in under an hour.) under, mindre enn

3) (subject to the authority of: As a foreman, he has about fifty workers under him.) under

4) (used to express various states: The fort was under attack; The business improved under the new management; The matter is under consideration/discussion.) under

- under-

under

adv. \/ˈʌndə\/

1) (neden)under

• we had a living room on top and bedrooms under

2) under vann

• he stayed under for two minutes

3) ( om narkose) borte, bevisstløs

as under i likhet med nedenstående

down under se ➢ down

go under synke mislykkes ( ved narkose) miste bevisstheten

under way i gang

• the meeting is now under way

prep. \/ˈʌndə\/

1) ( om posisjon eller retning) under, innunder, bortunder, oppunder, inn under, bort under, opp under, innenfor, nedenfor, foran, ved foten av, i skyggen av

• the cat is under the table

• the streets are under water after the heavy rain

• she put the box under her bed

• he had the bottle under his coat

• the dog came out from under the table

• the village lies under the hill

• she smoked under the teacher's very nose

2) (om dominans, autoritet eller kontroll) under, bundet av, hos

• everything's under control!

• there were a number of reforms under Queen Victoria

• he's studying under the great master

• she never talks to those under her

• it was given under his hand

• I can't say anything, I'm under a vow

3) (om lover, regler og avtaler) i samsvar med, etter, i henhold til

• they exported oil under the terms of the treaty

4) ( om kategorisering) under, på

• place it under H

5) (om beløp, tall eller norm) under, mindre enn

• children under 14 years are not admitted

• I can do it in under a week

• this letter is under the date of the 5th

6) ( om prosess eller tilstand) under, i

• the matter is under examination

• the apartments are under construction

• the question under the debate was a hot potato

• he's under the delusion that he's the best man for the job

7) ( landbruk) tilsådd med, beplantet med

• we have a field under wheat

• they have a large acreage under wheat

1) (in or to a position lower than, or covered by: Your pencil is under the chair; Strange plants grow under the sea.) pod

2) (less than, or lower in rank than: Children under five should not cross the street alone; You can do the job in under an hour.) manj kot

3) (subject to the authority of: As a foreman, he has about fifty workers under him.) pod

4) (used to express various states: The fort was under attack; The business improved under the new management; The matter is under consideration/discussion.) za časa; v

- under-

* * *

pod; pod vodstvom, pod zaščito; pod vplivom (pritiskom); za časa, za vladanja, med; na osnovi, na temelju, v smislu, po

from under — izpod

under age — mladoleten

under arms — pod orožjem

under one's belt figuratively v želodcu

no one under a bishop — nobeden manj kot škof

under darkness — v temi, v zaščiti teme

under construction — v gradnji

under 20 years of age — pod 20 leti starosti

the children under her charge — otroci v njenem varstvu

under these circumstances — v teh okoliščinah

a criminal under sentence of death — na smrt obsojeni zločinec

under consideration — v proučevanju, v pretresanju

under that edict — na osnovi one odredbe

under favour — če se sme reči

employee under notice — nameščenec z odpovedjo

the matter under discussion — zadeva, ki je v diskusiji

under my hand and seal — z mojim podpisom in pečatom

under ( —ali by) one's own hand — lastnoročno

under hatches — v zaporu; propadel, mrtev; nautical pod palubo

under the king John — za časa vlade kralja Ivana

under the novelty — pod vtisom te novosti

patient under misfortunes — potrpežljiv v nesreči

under pretence that... — pod pretvezo, da...

under pain of death — pod smrtno kaznijo

under penalty of fine — pod kaznijo globe

ship under the sea nautical brez pomoči morju izpostavljena ladja

under the treaty — po pogodbi

the under thirties — osebe pod 30 leti

under the rose figuratively zaupno

the car is under repair — avto je v popravilu

she is under treatment — ona je na zdravljenju

I cannot do it under an hour — potrebujem najmanj eno uro za to

to be under a cloud figuratively biti v nemilosti; biti v denarni stiski

the ship is under sail — ladja pluje z razpetimi jadri

the ship is under way — ladja je na poti

he spoke under his breath — govoril je zelo tiho

to study under a professor — študirati pod vodstvom profesorja

the total falls under what was expected — celotna vsota je ostala pod pričakovanjem;

spodaj; niže; manj

as under — kot (je) niže navedeno

boys of 15 and under — 15 let in manj stari dečki

to go under American podleči, propasti

the firm is sure to go under — tvrdka bo gotovo propadla

the sun is under — sonce je zašlo;

spodnji; nižji; podrejen

the under classes — nižji razredi

the under dog colloquially pes (figuratively oseba), ki podleže v boju

the under jaw — spodnja čeljust

the under side — spodnja stran

an under dose — premajhna doza

1) (underneath, below) (indicating position) unter (+ Dat.); (indicating motion) unter (+ Akk.)

2) (undergoing)

3) (in conditions of) bei [Stress, hohen Temperaturen usw.]

4) (subject to) unter (+ Dat.)

5) (in accordance with)

6) (with the use of) unter (+ Dat.)

7) (less than) unter (+ Dat.)

1) (in or to a lower or subordinate position) darunter

2) (in/into a state of unconsciousness)

* * *

1) (in or to a position lower than, or covered by: Your pencil is under the chair; Strange plants grow under the sea.) unter

2) (less than, or lower in rank than: Children under five should not cross the street alone; You can do the job in under an hour.) unter,weniger als

3) (subject to the authority of: As a foreman, he has about fifty workers under him.) unter

4) (used to express various states: The fort was under attack; The business improved under the new management; The matter is under consideration/discussion.) unter,in

- under-

* * *

[ˈʌndəʳ, AM -ɚ]

I. prep

1. (below) unter + dat; with verbs of motion unter + akk

he hid \under the bed er versteckte sich unterm Bett

she put the thermometer \under my tongue sie steckte mir das Thermometer unter die Zunge

\under water unter Wasser

2. (supporting) unter + dat

it felt good to have the earth \under my feet again es war schön, wieder festen Boden unter meinen Füßen zu haben

3. (covered by) unter + dat

he wore a white shirt \under his jacket unter seiner Jacke trug er ein weißes Hemd

4. (one side to other) unter + dat

a cold draught blew \under the door ein kalter Zug blies unter der Tür durch

5. (less than) unter + dat

all items cost \under a pound alle Artikel kosten weniger als ein Pfund

\under a minute weniger als eine Minute

6. (inferior to)

to be \under sb unter jdm sein [o stehen

7. (governed by) unter + dat

the Colonel has hundreds of soldiers \under him dem Oberst unterstehen Hunderte von Soldaten

they are \under strict orders sie haben strenge Anweisungen

to be \under sb's influence unter jds Einfluss stehen

\under the Romans unter römischer Herrschaft

\under the supervision of sb unter jds Aufsicht

8. (in condition/state of) unter + dat

\under anaesthetic unter Betäubung [o Narkose]

\under arrest/control/quarantine unter Arrest/Kontrolle/Quarantäne

\under [no] circumstances unter [keinen] Umständen

\under oath unter Eid

\under pressure/stress unter Druck/Stress

\under repair in Reparatur

\under suspicion unter Verdacht

9. (in accordance to) gemäß + dat

\under our agreement gemäß unserer Vereinbarung

10. (referred to as) unter + dat

he writes \under a pseudonym er schreibt unter einem Pseudonym

11. (in the category of) unter + dat

you'll find that \under Goethe das finden Sie unter Goethe

12. (during time of)

\under Pisces/Virgo/Aries im Sternzeichen Fische/Jungfrau/Widder

▶ [already] \under way [bereits [o schon]] im Gange

to get \under way anfangen, beginnen

II. adv inv

1. ( also fig: sink)

to go \under untergehen a. fig

thousands of companies went \under during the recession tausende Firmen machten während der Rezession Pleite

2. (below specified age, amount)

suitable for kids of five and \under geeignet für Kinder von fünf Jahren und darunter

£30 and \under 30 Pfund und weniger

▶ to get out from \under sich akk aufrappeln fam

III. adj pred, inv

▪ to be \under unter Narkose stehen

* * *

1. prep

1) (= beneath place) unter (+dat); (direction) unter (+acc)

2) (= less than) unter (+dat)

3) (= subordinate to, under influence of etc) unter (+dat)

4) (= according to) nach (+dat), gemäß (+dat), laut (+dat)

2. adv

1) (= beneath) unten; (= unconscious) bewusstlos

2) (= less) darunter

* * *

under [ˈʌndə(r)]

A präp

1. allg unter (dat oder akk)

2. (Lage) unter (dat), unterhalb von (oder gen):

from under the table unter dem Tisch hervor

3. (Richtung) unter (akk):

4. unter (dat), am Fuße von (oder gen):

5. (zeitlich) unter (dat), während:

under his rule;

he lived under the Stuarts er lebte zur Zeit der Stuarts;

under the date of unter dem Datum vom 1. Januar etc

6. unter der Führung von (oder gen), auch MUS unter der Leitung von (oder gen), unter (dat):

he fought under Wellington;

have sb under one jemanden unter sich haben

7. unter (dat), unter dem Schutz von (oder gen), unter Zuhilfenahme von (oder gen):

under arms unter Waffen;

under darkness im Schutz der Dunkelheit

8. unter (dat), geringer als, weniger als:

persons under 40 (years of age) Personen unter 40 (Jahren);

the under-thirties die Personen unter 30 Jahren;

in under an hour in weniger als einer Stunde;

he cannot do it under an hour er braucht mindestens eine Stunde dazu oder dafür;

it cost him under £20 es kostete ihn weniger als 20 Pfund

9. fig unter (dat):

under his tyranny;

a criminal under sentence of death ein zum Tode verurteilter Verbrecher;

under supervision unter Aufsicht;

under alcohol unter Alkohol, alkoholisiert;

under an assumed name unter einem angenommenen Namen

10. gemäß, laut, nach:

under the terms of the contract;

a) nach den gesetzlichen Bestimmungen,

b) im Rahmen des Gesetzes;

claims under a contract Forderungen aus einem Vertrag

11. in (dat):

under treatment in Behandlung

12. bei:

13. mit:

under sb’s signature mit jemandes Unterschrift, (eigenhändig) von jemandem unterschrieben oder unterzeichnet

B adv

1. darunter, unter:

children of five and under fünfjährige und jüngere Kinder. → go under, keep under, etc

2. unten:

as under wie unten (angeführt);

get out from under US sl

a) sich herauswinden,

b) den Verlust wettmachen

C adj (oft in Zusammensetzungen)

1. unter(er, e, es), Unter…:

the under layers die unteren Schichten oder Lagen;

the under surface die Unterseite

2. unter(er, e, es), nieder(er, e, es), untergeordnet, Unter…:

the under classes die unteren oder niederen Klassen

3. (nur in Zusammensetzungen) ungenügend, zu gering: → underdose A, etc

* * *

1) (underneath, below) (indicating position) unter (+ Dat.); (indicating motion) unter (+ Akk.)

2) (undergoing)

3) (in conditions of) bei [Stress, hohen Temperaturen usw.]

4) (subject to) unter (+ Dat.)

5) (in accordance with)

6) (with the use of) unter (+ Dat.)

7) (less than) unter (+ Dat.)

1) (in or to a lower or subordinate position) darunter

2) (in/into a state of unconsciousness)

* * *

unter Wahrung meiner Rechte m. adj.

unten adj. prep.

darunter präp.

unter präp.

1 noun

(a) (piece of land) terrain m;

∎ the development project includes sites for small businesses le projet immobilier prévoit des terrains pour de petites entreprises

(b) (building) site chantier m (de construction)

site foreman chef m de chantier;

site manager directeur(trice) m, f de chantier

(c) COMPUTING site m

(d) MARKETING (for advertising) emplacement m

2 transitive verb

situer

1) задача; проблема

2) неисправность

3) трудность, затруднение

•

- absorption problem

- abstract problem

- accompanying problem

- adjoint problem

- advertizing problem

- algebraic problem

- algorithmically unsolvable problem

- applied problem

- approach problem

- arithmetical problem

- assignment problem

- asymptotic problem

- attack-and-defense problem

- augmented problem

- auxiliary problem

- axially symmetric problem

- ballistic problem

- ballot problem

- barrier problem

- basic maximum problem

- betting problem

- bidual problem

- bifurcation problem

- biharmonic problem

- binary problem

- birthday problem

- blending problem

- bottleneck problem

- boundary problem

- bounded problem

- bounded-variable problem

- brachistochrone problem

- burglar problem

- cake-cutting problem

- calculability problem

- canonical problem

- capacitated transportation problem

- cataloguing problem

- caterer problem

- Cauchy problem

- center problem

- center-and-focus problem

- central asymptotic problem

- chance-constrained problem

- characteristic problem

- characterization problem

- check problem

- classical problem

- classification problem

- closed problem

- coercitive problem

- coexistence problem

- coin-tossing problem

- coin-weighing problem

- coloring problem

- combinatorial problem

- compactness problem

- competitive problem

- compression problem

- computational problem

- conceptual problem

- conjugate problem

- constant problem

- construction problem

- continuum problem

- contract-awards problem

- control problem

- convergence problem

- convex programming problem

- correspondence problem

- counterfeit coin problem

- crossing problem

- dancing problem

- decidability problem

- decision problem under certainty

- decoding problem

- degenerate problem

- delivery problem

- diet problem

- differentiation problem

- diffusion problem

- dimensionality problem

- direct problem

- Dirichlet's problem

- disorder problem

- distribution problem

- divisor problem

- domino problem

- econometric problem

- effectivity problem

- eigenvalue problem

- election problem

- embedding problem

- empirical problem

- encounter problem

- entrance-fee problem

- enumerability problem

- enumeration problem

- epistemological problem

- equilibrium problem

- equivalence problem

- equivalent problem

- error minimization problem

- estimation problem

- evolutionary problem

- explosion problem

- extended problem

- extension problem

- extremal problem

- feasibility problem

- feasible problem

- feed mix problem

- filtering problem

- finitary problem

- five queens problem

- fixed-charge problem

- flow problem

- forecasting problem

- foreman problem

- gambler ruin problem

- general problem

- generalized problem

- gold-mining problem

- graph-theoretic problem

- halting problem

- hill-climbing problem

- homogeneity problem

- homogeneous problem

- homotopy problem

- identification problem

- identity problem

- ill-conditioned problem

- ill-defined problem

- ill-posed problem

- ill-structured problem

- improperly posed problem

- index of problem

- infeasible problem

- inference problem

- infinite medium problem

- infinitesimal problem

- information retrieval problem

- inhomogeneous problem

- initial problem

- initial-value problem

- inner problem

- insoluble problem

- integration problem

- interpolation problem

- intractable problem

- intricate problem

- invariant problem

- inverse problem

- inversion problem

- irregular problem

- isometric problem

- isomorphism problem

- isoperimetric problem

- knapsack problem

- knight problem

- labyrinth problem

- lattice search problem

- linear problem

- loading problem

- location problem

- many-body problem

- map-colouring problem

- map-folding problem

- mass problem

- master problem

- matching problem

- mathematical problem

- maximization problem

- maximum-flow problem

- menage problem

- menu problem

- metrization problem

- minimal length problem

- minimax problem

- minimization problem

- mixed problem

- module problem

- moment problem

- monkey-banana problem

- monotonic problem

- moving boundary problem

- multicriterion problem

- multidecision problem

- multidimensional problem

- multiextremal problem

- multiindex problem

- multiple-integral problem

- multivariate problem

- natural problem

- necklace problem

- needle problem

- nested problem

- network flow problem

- network problem

- newspaper-boy problem

- nondifferentiable problem

- nonhomogeneous problem

- nonlinear problem

- nonlinear programming problem

- nonparametric problem

- nonsequential problem

- nonstationary problem

- nonstochastic problem

- non-uniform problem

- nonwell-posed problem

- normal problem

- normative problem

- number problem

- numerical problem

- observation problem

- occupancy problem

- one-armed bandit problem

- one-dimensional problem

- one-sample problem

- open problem

- optimal assignment problem

- optimization problem

- optimum problem

- orderability problem

- original problem

- outer problem

- overspecified problem

- packing problem

- parametric dual problem

- parking problem

- partition problem

- percolation problem

- permutation problem

- personnel-assignment problem

- petrol blending problem

- picnic problem

- plane problem

- Plateau's problem

- polar problem

- polynomial approximation problem

- positional problem

- postman problem

- power moment problem

- prediction problem

- prefix problem

- prey-predator problem

- primal problem

- probabilistic problem

- problem of allocation

- problem of deadly embrace

- problem of derangements

- problem of eight queens

- problem of elimination

- problem of form equivalence

- problem of interpolating

- problem of interpretation

- problem of inverse probability

- problem of localization

- problem of matching

- problem of projectivity

- problem of reduction

- problem of separability

- problem of six red disks

- problem of solvability

- problem of thirteen spheres

- problem of uniqueness

- problem of warders

- programming problem

- properly posed problem

- purchasing problem

- pursuit problem

- puzzle problem

- pyramided problem

- quadratic programming problem

- quadrature problem

- quasilinear problem

- random-walk problem

- ranking problem

- realizability problem

- recursively enumerable problem

- reduced problem

- reducibility problem

- reducible problem

- regression problem

- relaxed problem

- rendezvous problem

- representation problem

- resource allocation problem

- restricted problem

- roulette problem

- routine problem

- ruin problem

- saddle point problem

- satisfiability problem

- scheduling problem

- schoolgirls problem

- scope of problem

- search problem

- secretary problem

- self-adjoint problem

- semidefinite problem

- separable problem

- separation problem

- sequencing problem

- sequential decision problem

- singular problem

- solvable problem

- special problem

- specialization problem

- spectral problem

- stable marriage problem

- statistical problem

- stereometric problem

- stiff problem

- stopping problem

- structural problem

- substitution problem

- symmetric problem

- systems analysis problem

- taxicab problem

- tenth problem

- termination problem

- ternary problem

- three body problem

- three-choice problem

- three-color problem

- three-dimensional problem

- three-point problem

- timetable problem

- tournament problem

- toymaker problem

- trace problem

- tradeoff problem

- traffic problem

- trajectory problem

- transformed problem

- transport problem

- transportation problem

- transshipment problem

- trasport problem

- travelling salesman problem

- tree-structured problem

- triangulizability problem

- trigonometric moment problem

- trigonometric problem

- trim problem

- two body problem

- two noncharacteristic problem

- two-armed-bandit problem

- two-body problem

- two-choice problem

- two-dimensional problem

- two-means problem

- two-point boundary problem

- two-sample problem

- uncertainty problem

- unconstrained problem

- undecidable problem

- underspecified problem

- unicity problem

- universal problem

- unsolvable problem

- unstable problem

- unstructural problem

- unsymmetric dual problem

- variational problem

- waiting time problem

- warehousing problem

- well-behaved problem

- well-defined problem

- well-formulated problem

- well-set problem

- well-structured problem

- word problem

- worked problem

SUBJECT AREA: Land transport, Railways and locomotives

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Hackworth trained under his father, who was Foreman Blacksmith at Wylam colliery, and succeeded him upon his death in 1807. Between 1812 and 1816 he helped to build and maintain the Wylam locomotives under William Hedley. He then moved to Walbottle colliery, but during 1824 he took temporary charge of Robert Stephenson \& Co.'s works while George Stephenson was surveying the Liverpool \& Manchester Railway and Robert Stephenson was away in South America. In May 1825 Hackworth was appointed to the Stockton \& Darlington Railway (S \& DR) "to have superintendence of the permanent (i.e. stationary) and locomotive engines". He established the workshops at Shildon, and when the railway opened in September he became in effect the first locomotive superintendent of a railway company. From experience of operating Robert Stephenson \& Co.'s locomotives he was able to make many detail improvements, notably spring safety valves. In 1827 he designed and built the locomotive Royal George, with six wheels coupled and inverted vertical cylinders driving the rear pair. From the pistons, drive was direct by way of piston rods and connecting rods to crankpins on the wheels, the first instance of the use of this layout on a locomotive. Royal George was the most powerful and satisfactory locomotive on the S \& DR to date and was the forerunner of Hackworth's type of heavy-goods locomotive, which was built until the mid-1840s.

For the Rainhill Trials in 1829 Hackworth built and entered the locomotive Sans Pareil, which was subsequently used on the Bol ton \& Leigh Railway and is now in the Science Museum, London. A working replica was built for the 150th anniversary of the Liverpool \& Manchester Railway in 1980. In 1833 a further agreement with the S \& DR enabled Hackworth, while remaining in charge of their locomotives, to set up a locomotive and engineering works on his own account. Its products eventually included locomotives for the London, Brighton \& South Coast and York, Newcastle \& Berwick Railways, as well as some of the earliest locomotives exported to Russia and Canada. Hackworth's son, John Wesley Hackworth, was also an engineer and invented the radial valve gear for steam engines that bears his name.

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SUBJECT AREA: Mechanical, pneumatic and hydraulic engineering

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Henry Maudslay was the third son of an ex-soldier and storekeeper at Woolwich Arsenal. At the age of 12 he was employed at the Arsenal filling cartridges; two years later he was transferred to the woodworking department, adjacent to the smithy, to which he moved when 15 years old. He was a rapid learner, and three years later Joseph Bramah took him on for the construction of special tools required for the mass-production of his locks. Maudslay was thus employed for the next eight years. He became Bramah's foreman, married his housekeeper, Sarah Tindale, and, unable to better himself, decided to leave and set up on his own. He soon outgrew his first premises in Wells Street and moved to Margaret Street, off Oxford Street, where some examples of his workmanship were displayed in the window. These caught the attention of a visiting Frenchman, de Bacquancourt; he was a friend of Marc Isambard Brunel, who was then in the early stages of designing the block-making machinery later installed at Portsmouth dockyard.

Brunel wanted first a set of working models, as he did not think that the Lords of the Admiralty would be capable of understanding engineering drawings; Maudslay made these for him within the next two years. Sir Samuel Bentham, Inspector-General of Naval Works, agreed that Brunel's system was superior to the one that he had gone some way in developing; the Admiralty approved, and an order was placed for the complete plant. The manufacture of the machinery occupied Maudslay for the next six years; he was assisted by a draughtsman whom he took on from Portsmouth dockyard, Joshua Field (1786–1863), who became his partner in Maudslay, Son and Field. There were as many as eighty employees at Margaret Street until, in 1810, larger premises became necessary and a new works was built at Lambeth Marsh where, eventually, there were up to two hundred workers. The new factory was flanked by two houses, one of which was occupied by Maudslay, the other by Field. The firm became noted for its production of marine steam-engines, notably Maudslay's table engine which was first introduced in 1807.

Maudslay was a consummate craftsman who was never happier than when working at his bench or at a machine tool; he was also one of the first engineers to appreciate the virtues of standardization. Evidence of this appreciation is to be found in his work in the development of the Bramah lock and then on the machine tools for the manufacture of ship's blocks to Marc Brunel's designs; possibly his most important contribution was the invention in 1797 of the metal lathe. He made a number of surface plates of the finest quality. The most celebrated of his numerous measuring devices was a micrometer-based machine which he termed his "Lord Chancellor" because, in the machine shop, it represented the "final court of appeal", measuring to one-thousandth of an inch.

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SUBJECT AREA: Land transport, Railways and locomotives

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In the mid-1850s Saxby was a foreman in the Brighton Works of the London Brighton \& South Coast Railway, where he had no doubt become familiar with construction of semaphore signals of the type invented by C.H. Gregory; the London-Brighton line was one of the first over which these were installed. In the 1850s points and signals were usually worked independently, and it was to eliminate the risk of accident from conflicting points and signal positions that Saxby in 1856 patented an arrangement by which related points and signals would be operated simultaneously by a single lever.

Others were concerned with the same problem. In 1855 Vignier, an employee of the Western Railway of France, had made an interlocking apparatus for junctions, and in 1859 Austin Chambers, who worked for the North London Railway, installed at Kentish Town Junction an interlocking lever frame in which a movement that depended upon another could not even commence until the earlier one was completed. He patented it early in 1860; Saxby patented his own version of such an apparatus later the same year. In 1863 Saxby left the London Brighton \& South Coast Railway to enter into a partnership with J.S.Farmer and established Saxby \& Farmer's railway signalling works at Kilburn, London. The firm manufactured, installed and maintained signalling equipment for many prominent railway companies. Its interlocking frames made possible installation of complex track layouts at increasingly busy London termini possible.

In 1867 Saxby \& Farmer purchased Chambers's patent of 1860, Later developments by the firm included effective interlocking actuated by lifting a lever's catch handle, rather than by the lever itself (1871), and an improved locking frame known as the "gridiron" (1874). This was eventually superseded by tappet interlocking, which had been invented by James Deakin of the rival firm Stevens \& Co. in 1870 but for which patent protection had been lost through non-renewal.

Saxby \& Farmer's equipment was also much used on the European continent, in India and in the USA, to which it introduced interlocking. A second manufacturing works was set up in 1878 at Creil (Oise), France, and when the partnership terminated in 1888 Saxby moved to Creil and managed the works himself until he retired to Sussex in 1900.

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