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1 сигнал, отражающий ход процесса
Automation: historical signalУниверсальный русско-английский словарь > сигнал, отражающий ход процесса
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2 alerta
adj.alert.adv.on the alert, on the lookout, on the watch.intj.look out, alert, watch out, be alert.f.1 alert.alerta roja red alert2 stand-by, standby.3 arousal.pres.indicat.3rd person singular (él/ella/ello) present indicative of spanish verb: alertar.imperat.2nd person singular (tú) Imperative of Spanish verb: alertar.* * *► adverbio1 (vigilante) on the alert1 (atención) alert1 (señal) alert, warning1 look/watch out!\dar la (voz de) alerta to give the alerten estado de alerta on the alert* * *1. noun f. 2. adj.alert, watchful* * *1.EXCL watch out!2.ADJ ADV alert, watchfulestar alerta, estar ojo alerta — to be on the alert
3.SF alertdar la alerta, dar la voz de alerta — to raise the alarm
* * *Iadjetivo or adjetivo invariable alertestar alerta(s) — ( tener cuidado) to be alert; ( estar en guardia) to be on the alert
IImantener el ojo/el oído alerta — to keep watch/keep one's ears open
adverbio on the alertIIIfemenino alert* * *= vigilance, vigilant, watchful.Ex. Factors that might adversely impact the ethical behaviour of the publishing, vending and librarianship community are examined, and the need for professionalism and vigilance of the community is emphasised.Ex. After a discussion of the historical background to copyright, the reasons why libraries have had to become vigilant about infringement of copyright are examined.Ex. Though in the teacher's case it does mean that he is more watchful for opportunities.----* alerta amarilla = yellow alert.* alerta del tiempo = weather warning.* alerta informativa = news alerts, information alert.* alerta roja = red alert.* alerta terrorista = terror alert.* alerta verde = green alert.* en alerta roja = on red alert.* en estado de alerta = on standby, on alert.* estado de alerta = state of alert.* estar a la alerta de = be wary of.* poner en alerta = put on + standby, put on + alert, place + Nombre + on standby.* poner en estado de alerta = put on + standby, put on + alert, place + Nombre + on standby.* señal de alerta = warning sign, warning signal.* servicio de alerta = alert service.* sistema de alerta temprana = early warning system.* * *Iadjetivo or adjetivo invariable alertestar alerta(s) — ( tener cuidado) to be alert; ( estar en guardia) to be on the alert
IImantener el ojo/el oído alerta — to keep watch/keep one's ears open
adverbio on the alertIIIfemenino alert* * *= vigilance, vigilant, watchful.Ex: Factors that might adversely impact the ethical behaviour of the publishing, vending and librarianship community are examined, and the need for professionalism and vigilance of the community is emphasised.
Ex: After a discussion of the historical background to copyright, the reasons why libraries have had to become vigilant about infringement of copyright are examined.Ex: Though in the teacher's case it does mean that he is more watchful for opportunities.* alerta amarilla = yellow alert.* alerta del tiempo = weather warning.* alerta informativa = news alerts, information alert.* alerta roja = red alert.* alerta terrorista = terror alert.* alerta verde = green alert.* en alerta roja = on red alert.* en estado de alerta = on standby, on alert.* estado de alerta = state of alert.* estar a la alerta de = be wary of.* poner en alerta = put on + standby, put on + alert, place + Nombre + on standby.* poner en estado de alerta = put on + standby, put on + alert, place + Nombre + on standby.* señal de alerta = warning sign, warning signal.* servicio de alerta = alert service.* sistema de alerta temprana = early warning system.* * *oralerttenemos que estar alerta(s) we have to be on the alertmantener el ojo alerta to keep watch, keep an eye out ( colloq)mantener el oído alerta to keep one's ears openon the alerten estado de alerta on alertuna llamada telefónica puso en alerta a la policía a telephone call alerted the policealguien dio la (voz de) alerta someone raised the alarmse oyeron gritos de alerta people could be heard shouting to raise the alarmCompuesto:red alert* * *
Del verbo alertar: ( conjugate alertar)
alerta es:
3ª persona singular (él/ella/usted) presente indicativo2ª persona singular (tú) imperativo
Multiple Entries:
alerta
alertar
alerta adjetivo
alert;
( estar en guardia) to be on the alert;
■ sustantivo femenino: dar la (voz de) alerta to raise the alarm;
en estado de alerta on alert
alertar ( conjugate alertar) verbo transitivo alerta a algn de algo to alert sb to sth
alerta
I adjetivo & adverbio alert: el perro puso las orejas alerta, the dog pricked up its ears
estar alerta, to be alert
II sustantivo femenino alert
dar la alerta, to alert
alertar verbo transitivo to alert [de, to]: los bomberos nos alertaron sobre el peligro de derrumbamiento, the fire brigade alerted us to the danger of collapse
' alerta' also found in these entries:
Spanish:
atento
- tanto
English:
alert
- look out for
- stand-to
- standby
- toe
- vigilant
- watch
- wit
- guard
- stand
* * *♦ adj o adj invalert♦ nfalert;en estado de alerta on alert;pusieron en alerta a las tropas they put the troops on standby;el vigía dio la (voz de) alerta the lookout raised the alarmalerta roja red alert♦ advon the alert;estar alerta to be on the alert♦ interjwatch o look out!* * *I adv:estar alerta be on the alert;estar ojo alerta keep an eye out;¡alerta! watch out!, be careful!II f alert;dar la alerta raise the alarm;poner en alerta alert;en estado de alerta on alert, in a state of alert* * *alerta adv: on the alertalerta nf: alert, alarm* * *alerta n alert -
3 marquer
marquer [maʀke]➭ TABLE 11. transitive verba. (par un signe distinctif) [+ objet] to mark ; [+ animal, criminel] to brand ; [+ marchandise] to labelc. ( = écrire) to write down• qu'y a-t-il de marqué ? what does it say?d. ( = affecter) to mark2. intransitive verb[événement, personnalité] to stand out• ne pose pas le verre sur la table, ça marque don't put the glass down on the table, it will leave a mark* * *maʀke
1.
1) ( étiqueter) to mark [article]; to brand [bétail]; to mark out [emplacement, limite]2) ( signaler) to mark, to signal [début, rupture]3) ( laisser une trace sur) [personne, coup] to mark [corps, objet]4) ( influencer) [événement, œuvre] to leave its mark on [personne, esprit]c'est quelqu'un qui m'a beaucoup marqué — he/she was a strong influence on me
5) ( écrire) to mark [prix]; to write [something] (down) [renseignement]6) ( indiquer) [montre] to say [heure]; [jauge, chiffres] to show [pression, température]marquer la mesure — Musique to beat time
7) ( exprimer) to show [volonté, désapprobation, sentiment]il faut marquer le coup — ( célébrer) let's celebrate; ( exprimer le mécontentement) we can't let it go just like that
8)9) Sport to score [but, point]; to mark [adversaire]
2.
verbe intransitif1) ( laisser une trace) to leave a mark ( sur on)* * *maʀke1. vt1) (= indiquer) to mark, (= inscrire) to write downPeux-tu marquer sur la carte où se trouve le village? — Can you mark where the village is on the map?
2) [bétail] to brand3) (= accentuer) [taille] to emphasize4) (= manifester) [son refus, son intérêt] to show5) [occasion, événement] to mark, to celebratepour marquer l'événement — to mark the occasion, to celebrate the occasion
6)marquer qn [personne] — to make a deep impression on sb, [événement] to leave its mark on sb
7)8) SPORT, [but, point] to scoreL'équipe irlandaise a marqué dix points. — The Irish team scored ten points.
marquer les points (= tenir la marque) — to keep the score
9) SPORT, [joueur] to markmarquer le pas fig — to mark time
2. vi1) [événement, personnalité] to stand out, to be outstanding2) SPORT to score* * *marquer verb table: aimerA vtr1 ( étiqueter) to mark [article]; to brand [bétail]; to mark out [emplacement, limite]; marquer des vêtements au nom d'un enfant to put nametapes on a child's clothes; marquer d'une croix to mark with a cross;2 ( signaler) to mark, to signal [début, fin, rupture]; marquer la reprise des hostilités to mark ou signal the renewal of hostilities;3 ( laisser une trace sur) [personne, coup, empreinte] to mark [corps, objet]; des taches de graisse marquent les pages the pages are covered in greasy marks; ⇒ blanc;4 ( influencer) [événement, drame, œuvre] to leave its mark on [personne, esprit]; c'est quelqu'un qui m'a beaucoup marqué he/she was a strong influence on me; c'est un événement qui m'a beaucoup marqué it's an event that really left its mark on me;5 ( écrire) to mark [prix]; to write [sth] (down), to put [sth] (down) [renseignement]; j'ai oublié de marquer la date dans mon agenda I forgot to put the date in my diary; marquez cela sur mon compte put it on my account; marquer les élèves absents to mark students absent; qu'est-ce qu'il y a de marqué? what does it say?;6 ( indiquer) [montre] to say [heure]; [jauge, chiffres] to show [pression, température]; l'horloge marque dix heures the clock says ten o'clock; le thermomètre marque 35°C the thermometer registers ou says 35°C; marquer le féminin Ling to indicate the feminine; l'aiguille marquait 60 km/h the speedometer was at 60 km/h; il marquait ses propos d' un hochement de tête he nodded emphatically as he spoke; marquer la mesure Mus to beat time;7 ( exprimer) to show [volonté, désapprobation, sentiment]; il faut marquer le coup ( célébrer) let's celebrate; ( exprimer le mécontentement) we can't let it go just like that; quand quelqu'un a mentionné son nom, il a marqué le coup when he heard the name, it really registered;8 ( souligner) marquer une fête nationale par un défilé to celebrate a national holiday with a parade;10 ( être caractéristique de) [idée, discours, attitude] to be characteristic of [personne, parti, époque];B vi1 ( laisser une trace) to leave a mark (sur on);2 ( être important) [homme politique, artiste] to leave one's mark; [événement] to be significant; un événement qui a marqué dans l'histoire a significant historical event;3 Sport to score; il a réussi à marquer he managed to score.[marke] verbe transitif1. [montrer] to markmarquer la limite de quelque chose to mark something (off), to mark the limit of somethingl'horloge marque 3 h the clock shows ou says 3 o'clockla balance marque 3 kg the scales register ou read 3 kgle thermomètre marque 40°C the thermometer shows ou registers 40°Cles lignes bleues marquent les frontières the blue lines show ou indicate where the border is2. [signaler - passage d'un texte] to mark ; [ - bétail] to brand, to mark ; [ - arbre] to blaze ; [ - linge] to label, to taga. [avec un signet] to mark one's place (with a bookmark)b. [en cornant la page] to turn down the corner of one's pagepour marquer sa confiance as a token ou mark of his trust4. [événement, date] to marka. [fêter quelque chose] to mark the occasionb. [réagir] to react5. [prendre en note] to write ou to take ou to note (down) (separable)marqué à l'encre/à la craie/au crayon sur le mur marked in ink/chalk/pencil on the wall, inked/chalked/pencilled on the wall6. [suj: difficulté, épreuve] to markle chagrin a marqué son visage his face is lined ou furrowed with sorrowça m'a beaucoup marqué it made a big ou lasting impression on me8. JEUX & SPORTmarquer les points to note ou to keep the scorel'argument est judicieux, vous marquez un point (figuré) the argument is valid, that's one to you ou you've scored a point9. [rythmer]10. COUTUREles robes, cet été, marqueront la taille this summer's dresses will emphasize the waist line————————[marke] verbe intransitif1. [personne, événement] to stand outsa mort a marqué dans ma vie his death had a great effect ou impact on my life2. [crayon, objet]attention, ça marque! careful, it'll leave a mark! -
4 notable
adj.1 remarkable, outstanding.2 notable, striking, famous, appreciable.f.good mark.m.1 (pass with) credit (education).2 notable, distinguished person (person).* * *► adjetivo1 (apreciable) noticeable; (considerable, marcado) considerable, remarkable■ la diferencia entre un coche y otro es notable there's a considerable difference between one car and another2 (digno de mención) noteworthy, notable3 (ilustre) well-known1 (persona) dignitary, notable2 (calificación) mark equivalent to between 70% and 80% in the Spanish marking system* * *adj.notable, remarkable* * *1. ADJ1) (=destacado) notableuna actuación verdaderamente notable — an outstanding performance, a truly notable performance
la exposición reúne a pintores tan notables como... — the exhibition brings together such notable o distinguished painters as...
2) (=considerable) [aumento, mejoría, diferencia] significant, considerableel enfermo ha experimentado una notable mejoría — the patient has experienced a significant o considerable improvement
la disminución de la contaminación ha sido notable — there has been a significant o considerable reduction in pollution
2.he sacado un notable — ≈ I got a B
3.SMPL* * *Iadjetivo notableIIposee una notable inteligencia — she is remarkably o extremely intelligent
a) (Educ) grade between 7 and 8.5 on a scale from 1 to 10b) ( persona importante) dignitary* * *= notable, noticeable, salient, striking, worthy, noteworthy, outstandingly + Adjetivo, noted, marked, acute, of note.Ex. There are notable differences in practice between the United States and the United Kingdom.Ex. The most noticeable effect the advent of Islam had on Arab names was not so much on structure as on choice.Ex. There must be instructions explaining salient features of the index.Ex. A very striking example of this is the fact that in all our rules there is the provision that anonymous publications should be entered under the author when known.Ex. Books were kept for historical records of deeds done by the inhabitants: their worthy acts as well as their sins.Ex. It essays simply to be a list of the more important, rare or otherwise noteworthy books available.Ex. It is tempting to quote the tremendous successes of outstandingly popular authors such as Harold Robbins, James Herriot, Catherine Cookson and a relatively small number of other household names (to book readers).Ex. Planning began about 9 months before the exhibition, with the recruitment of a noted Swiss book illustrator to design the stand.Ex. It hardly needs to be said that the microcomputer is now a fact of life, but its impact upon the world of information retrieval and libraries generally has been less marked than in many other areas.Ex. In some areas of study, notably the social sciences, the problems vocabulary are acute.Ex. Another analytical study of note is the one for Columbia University Libraries.----* aumento notable = rising tide.* incremento notable = rising tide.* notable por = noted for.* * *Iadjetivo notableIIposee una notable inteligencia — she is remarkably o extremely intelligent
a) (Educ) grade between 7 and 8.5 on a scale from 1 to 10b) ( persona importante) dignitary* * *= notable, noticeable, salient, striking, worthy, noteworthy, outstandingly + Adjetivo, noted, marked, acute, of note.Ex: There are notable differences in practice between the United States and the United Kingdom.
Ex: The most noticeable effect the advent of Islam had on Arab names was not so much on structure as on choice.Ex: There must be instructions explaining salient features of the index.Ex: A very striking example of this is the fact that in all our rules there is the provision that anonymous publications should be entered under the author when known.Ex: Books were kept for historical records of deeds done by the inhabitants: their worthy acts as well as their sins.Ex: It essays simply to be a list of the more important, rare or otherwise noteworthy books available.Ex: It is tempting to quote the tremendous successes of outstandingly popular authors such as Harold Robbins, James Herriot, Catherine Cookson and a relatively small number of other household names (to book readers).Ex: Planning began about 9 months before the exhibition, with the recruitment of a noted Swiss book illustrator to design the stand.Ex: It hardly needs to be said that the microcomputer is now a fact of life, but its impact upon the world of information retrieval and libraries generally has been less marked than in many other areas.Ex: In some areas of study, notably the social sciences, the problems vocabulary are acute.Ex: Another analytical study of note is the one for Columbia University Libraries.* aumento notable = rising tide.* incremento notable = rising tide.* notable por = noted for.* * *notableuna actuación notable an outstanding o a notable performanceposee una notable inteligencia she is remarkably o extremely intelligentéste es uno de los rasgos más notables de su obra this is one of the most notable characteristics of his workuna notable mejoría a marked o notable improvementuno de los estudios más notables sobre Cervantes one of the most notable o noteworthy studies on Cervantes1 ( Educ) grade between 7 and 8.5 on a scale from 1 to 102 (persona importante) dignitary* * *
notable adjetivo ‹diferencia/mejoría› notable;
posee una notable inteligencia she is remarkably o extremely intelligent
■ sustantivo masculinoa) (Educ) grade between 7 and 8.5 on a scale from 1 to 10
notable
I adj (cualidad, mérito) outstanding, remarkable
(distancia, diferencia) noticeable
II m Educ the grade of B: he conseguido un notable en geografía, I got a B in Geography
' notable' also found in these entries:
Spanish:
acusada
- acusado
- deterioro
- sensible
- grande
- notorio
- relevante
English:
endurance
- notable
- noticeable
- remarkable
- credit
* * *♦ adjremarkable, outstanding;hay una notable diferencia entre las dos propuestas there's a significant o clear difference between the two proposals;es un violinista notable he's an outstanding violinist♦ nm1. [nota] = mark between 7 and 8.9 out of 10, ≈ (pass with) credit, ≈ B2. [persona] dignitary* * *I adj remarkable, notableII m1 EDU B2:notables pl dignitaries* * *notable adj1) : notable, noteworthy2) : outstanding* * *notable1 adj considerable / remarkablenotable2 n very good / B -
5 atento
adj.1 attentive, heedful, careful, alert.2 attentive, courteous, heedful, helpful.3 polite, courteous.pres.indicat.1st person singular (yo) present indicative of spanish verb: atentar.* * *► adjetivo1 attentive2 (amable) polite, courteous\estar atento,-a a algo (prestar atención) to pay attention to something 2 (estar alerta) to be on the alert for something, keep an eye out for something, be on the lookout for* * *(f. - atenta)adj.* * *ADJ1) (=pendiente) [persona] attentive; [mirada] watchfultenéis que estar atentos en clase — you have to be attentive in class, you have to pay attention in class
estáte atento y avísanos si lo ves — stay alert o keep a look out and let us know if you see him
estar atento a — [+ explicación] to pay attention to; [+ peligro] to be on the alert for, be on the lookout for; [+ movimiento, ruido] to listen out for
hay que estar atento a cualquier error — you have to watch o listen out for the slightest mistake
2) (=cortés) attentiveun dependiente muy atento — a very helpful o attentive sales assistant
como indicaba en su atenta carta — frm as indicated in your kind letter frm
su atento y seguro servidor — frm yours truly
3)atento a algo — in view of sth, in consideration of sth frm
atento a que — considering that, in view of the fact that
* * *- ta adjetivo1)a) ( que presta atención) <alumno/público> attentiveb) ( alerta)atento! que te quemás! — (como interj) (RPl) watch out, you'll burn yourself!
2)a) ( amable) <esposo/anfitrión/camarero> attentiveen respuesta a su atenta carta — (Corresp) (frml) in reply to your kind letter
b) ( cortés) courteous* * *- ta adjetivo1)a) ( que presta atención) <alumno/público> attentiveb) ( alerta)atento! que te quemás! — (como interj) (RPl) watch out, you'll burn yourself!
2)a) ( amable) <esposo/anfitrión/camarero> attentiveen respuesta a su atenta carta — (Corresp) (frml) in reply to your kind letter
b) ( cortés) courteous* * *atento11 = careful, observant, vigilant, watchful, alert.Nota: Adjetivo.Ex: The format of the description in an analytical entry requires careful consideration.
Ex: Every member of staff has a duty to be observant where safety is concerned.Ex: After a discussion of the historical background to copyright, the reasons why libraries have had to become vigilant about infringement of copyright are examined.Ex: Though in the teacher's case it does mean that he is more watchful for opportunities.Ex: The alert interviewer may secure valuable unsolicited information as a by-product.* estar atento a = be on the lookout for, keep + Posesivo + eyes peeled, keep + Posesivo + eyes skinned.* mantener a Alguien atento = keep + Nombre + on + Posesivo + toes.* mantenerse atento = keep + Posesivo + eyes (wide) open.* mantenerse atento a lo que ocurre alrededor = have + an ear to the ground, keep + Posesivo + ear to the ground.atento22 = attentive, considerate, obliging, kind [kinder -comp., kindest -sup.].Ex: Thus in an attentive reader literature is expansive, visionary, challenging, subversive, in the true and best sense.
Ex: Library users fall into 4 groups: (1) patrons, who are considerate, grateful and undemanding; (2) 'pests' -- the in considerate; (3) 'pirates' who steal, deface and mutilate library property and materials; (4) 'vampires' whose enquiries make excessive demands upon the librarian's time.Ex: There are different styles of handling interpersonal conflict such as integrating, obliging, dominating, avoiding, and compromising.Ex: I would like to extend my thanks to our host who was kind enough to invite me.* * *atento -taA1 (que presta atención) ‹alumno/público› attentiveestáte atento pay attentionestar atento A algo to pay attention TO sthnunca está atento a las explicaciones he never pays attention o listens when you explain things to him2(alerta): estáte atento y avísame si viene alguien stay alert and let me know if anyone comesescuchaba con oídos atentos she listened attentively o carefully¡atento! ¡que te quemás! ( como interj) ( RPl); watch out, you'll burn yourself!estar atento A algo to be on the alert FOR sthestaba atento al menor sonido/movimiento he listened out for o was on the alert for the slightest sound/movementB (amable) attentiveun camarero muy atento a very attentive o helpful waiteres muy atento, siempre contesta a todas las cartas he's very courteous, he answers every letterse mostró poco atenta con los invitados she wasn't very attentive to her guests* * *
Del verbo atentar: ( conjugate atentar)
atento es:
1ª persona singular (yo) presente indicativo
atentó es:
3ª persona singular (él/ella/usted) pretérito indicativo
Multiple Entries:
atentar
atento
atentar ( conjugate atentar) verbo intransitivo:
atento contra la seguridad del Estado to threaten national security
atento -ta adjetivo
1
estar atento (a algo) to pay attention (to sth)b) ( alerta):
estar atento a algo to be on the alert for sth
2
ser atento con algn to be kind to sb
atentar verbo intransitivo esta mañana atentaron contra la vida de un famoso escritor, there was an attempt on a famous writer's life this morning
atento,-a adjetivo
1 attentive: estáte atento a los niños, keep an eye on the children
2 (amable) considerate, thoughtful
' atento' also found in these entries:
Spanish:
atenta
- correcta
- correcto
- para
- pendiente
- comedido
- cumplido
- mostrar
- recibir
- servidor
English:
alert
- appreciative
- attentive
- careless
- intent
- listen for
- listen out for
- mindful
- thoughtful
- watch out
- considerate
- inattentive
- obliging
- watch
* * *atento, -a♦ adj1. [pendiente] attentive;un alumno muy atento a very attentive pupil;una lectura atenta de la ley permite ver que… careful reading of the law shows that…;estar atento a [explicación, programa, lección] to pay attention to;[ruido, sonido] to listen out for; [acontecimientos, cambios, avances] to keep up with;escucha atento lo que te voy a decir listen carefully to what I'm going to tell you;se manifestaron bajo la atenta mirada de la policía they demonstrated under the watchful eye of the policetienes que ser más atento con los invitados you should pay more attention to your guests;¡qué chico más atento! what a nice young man!♦ interjRP Fam watch out!, be careful!;¡atento a la señal! wait for the signal* * *adj attentive;estar atento a algo pay attention to sth* * *atento, -ta adj1) : attentive, mindful2) cortés: courteous* * *atento adj1. (amable) kind / helpful2. (que presta atención) attentive -
6 De Forest, Lee
SUBJECT AREA: Broadcasting, Electronics and information technology, Photography, film and optics, Recording, Telecommunications[br]b. 26 August 1873 Council Bluffs, Iowa, USAd. 30 June 1961 Hollywood, California, USA[br]American electrical engineer and inventor principally known for his invention of the Audion, or triode, vacuum tube; also a pioneer of sound in the cinema.[br]De Forest was born into the family of a Congregational minister that moved to Alabama in 1879 when the father became President of a college for African-Americans; this was a position that led to the family's social ostracism by the white community. By the time he was 13 years old, De Forest was already a keen mechanical inventor, and in 1893, rejecting his father's plan for him to become a clergyman, he entered the Sheffield Scientific School of Yale University. Following his first degree, he went on to study the propagation of electromagnetic waves, gaining a PhD in physics in 1899 for his thesis on the "Reflection of Hertzian Waves from the Ends of Parallel Wires", probably the first US thesis in the field of radio.He then joined the Western Electric Company in Chicago where he helped develop the infant technology of wireless, working his way up from a modest post in the production area to a position in the experimental laboratory. There, working alone after normal working hours, he developed a detector of electromagnetic waves based on an electrolytic device similar to that already invented by Fleming in England. Recognizing his talents, a number of financial backers enabled him to set up his own business in 1902 under the name of De Forest Wireless Telegraphy Company; he was soon demonstrating wireless telegraphy to interested parties and entering into competition with the American Marconi Company.Despite the failure of this company because of fraud by his partners, he continued his experiments; in 1907, by adding a third electrode, a wire mesh, between the anode and cathode of the thermionic diode invented by Fleming in 1904, he was able to produce the amplifying device now known as the triode valve and achieve a sensitivity of radio-signal reception much greater than possible with the passive carborundum and electrolytic detectors hitherto available. Patented under the name Audion, this new vacuum device was soon successfully used for experimental broadcasts of music and speech in New York and Paris. The invention of the Audion has been described as the beginning of the electronic era. Although much development work was required before its full potential was realized, the Audion opened the way to progress in all areas of sound transmission, recording and reproduction. The patent was challenged by Fleming and it was not until 1943 that De Forest's claim was finally recognized.Overcoming the near failure of his new company, the De Forest Radio Telephone Company, as well as unsuccessful charges of fraudulent promotion of the Audion, he continued to exploit the potential of his invention. By 1912 he had used transformer-coupling of several Audion stages to achieve high gain at radio frequencies, making long-distance communication a practical proposition, and had applied positive feedback from the Audion output anode to its input grid to realize a stable transmitter oscillator and modulator. These successes led to prolonged patent litigation with Edwin Armstrong and others, and he eventually sold the manufacturing rights, in retrospect often for a pittance.During the early 1920s De Forest began a fruitful association with T.W.Case, who for around ten years had been working to perfect a moving-picture sound system. De Forest claimed to have had an interest in sound films as early as 1900, and Case now began to supply him with photoelectric cells and primitive sound cameras. He eventually devised a variable-density sound-on-film system utilizing a glow-discharge modulator, the Photion. By 1926 De Forest's Phonofilm had been successfully demonstrated in over fifty theatres and this system became the basis of Movietone. Though his ideas were on the right lines, the technology was insufficiently developed and it was left to others to produce a system acceptable to the film industry. However, De Forest had played a key role in transforming the nature of the film industry; within a space of five years the production of silent films had all but ceased.In the following decade De Forest applied the Audion to the development of medical diathermy. Finally, after spending most of his working life as an independent inventor and entrepreneur, he worked for a time during the Second World War at the Bell Telephone Laboratories on military applications of electronics.[br]Principal Honours and DistinctionsInstitute of Electronic and Radio Engineers Medal of Honour 1922. President, Institute of Electronic and Radio Engineers 1930. Institute of Electrical and Electronics Engineers Edison Medal 1946.Bibliography1904, "Electrolytic detectors", Electrician 54:94 (describes the electrolytic detector). 1907, US patent no. 841,387 (the Audion).1950, Father of Radio, Chicago: WIlcox \& Follett (autobiography).De Forest gave his own account of the development of his sound-on-film system in a series of articles: 1923. "The Phonofilm", Transactions of the Society of Motion Picture Engineers 16 (May): 61–75; 1924. "Phonofilm progress", Transactions of the Society of Motion Picture Engineers 20:17–19; 1927, "Recent developments in the Phonofilm", Transactions of the Society of Motion Picture Engineers 27:64–76; 1941, "Pioneering in talking pictures", Journal of the Society of Motion Picture Engineers 36 (January): 41–9.Further ReadingG.Carneal, 1930, A Conqueror of Space (biography).I.Levine, 1964, Electronics Pioneer, Lee De Forest (biography).E.I.Sponable, 1947, "Historical development of sound films", Journal of the Society of Motion Picture Engineers 48 (April): 275–303 (an authoritative account of De Forest's sound-film work, by Case's assistant).W.R.McLaurin, 1949, Invention and Innovation in the Radio Industry.C.F.Booth, 1955, "Fleming and De Forest. An appreciation", in Thermionic Valves 1904– 1954, IEE.V.J.Phillips, 1980, Early Radio Detectors, London: Peter Peregrinus.KF / JW
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