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1 system
1) система || системный3) вчт операционная система; программа-супервизор5) вчт большая программа6) метод; способ; алгоритм•system halted — "система остановлена" ( экранное сообщение об остановке компьютера при наличии серьёзной ошибки)
- CPsystem- H-system- h-system- hydrogen-air/lead battery hybrid system- Ksystem- Lsystem- L*a*b* system- master/slave computer system- p-system- y-system- Δ-system -
2 unit
1) единица, число 1 ( наименьшее положительное целое число)2) единица (физической) величины; единица измерения ( величины)3) элемент; компонент4) нейрон5) блок; узел; модуль; секция; звено6) прибор; устройство7) аппарат; установка•- unit under test
- abrasive-cleaning unit
- absolute units
- acknowledgement signal unit
- acoustic units
- allocation unit
- angle-tracking unit
- Ångström unit
- answer-back unit
- answering unit
- antenna coupler unit
- anticoincidence unit
- arbitrary unit
- arithmetic unit
- arithmetic and logic unit
- assembly unit
- associative unit
- attached unit
- audio processing unit
- audio-response unit
- automatic calling unit
- automatic lock-on unit
- automatic range tracking unit
- auxiliary power unit
- balanced-armature unit
- balancing unit
- base station unit
- base station control unit
- basic display unit
- basic measurement unit
- basic processing unit
- beam steering unit
- best matching unit
- bistable unit
- break-contact unit
- bubble unit
- bubble storage unit
- buffer unit
- bus interface unit
- camera control unit
- capacitor-resistor unit
- card punch unit
- card punching unit
- card-reader unit
- cassette unit
- central processing unit
- certificate signing unit
- CGS units
- changeover-contact unit
- channel unit
- channel service unit
- channel service unit/digital service unit
- chrominance unit
- clock unit
- cluster unit
- coefficient unit
- coil-spring reverberation unit
- coincidence unit
- communications control unit
- competitive unit
- computer interface unit
- connectionist unit
- control unit
- control-display unit
- converter unit
- conveyorized drying unit
- crosstalk unit
- curve scanning unit
- data unit
- data-acquisition unit
- data-adapter unit
- data-collection unit
- data encryption unit
- data-handling unit
- data transfer unit
- delay unit
- derived units
- developer unit
- dialing unit
- differentiating unit
- digital reverberation-echo unit
- digital service unit
- digital storage unit
- discrete unit
- disk unit
- display unit
- driver unit
- dual processing unit
- electron unit
- ENIGMA duration unit
- ENIGMA virtual page unit
- execution unit
- expansion unit
- experimental unit
- failed unit
- failure unit
- fixed-head disk unit
- floating-point processing unit
- forming unit
- frequency identification unit
- fuel-cell unit
- function unit
- fundamental units
- GeForce graphics processing unit
- geometrical unit
- graphics processing unit
- hidden unit
- hidden-layer unit
- Horner unit
- imaginary unit
- inductive energy storage unit
- inertial measurement unit
- information unit
- in-order retirement unit
- input unit
- input/output unit
- inquiry unit
- instruction unit
- instruction fetch unit
- integrating unit
- interface unit
- internetwork unit
- interrogating unit
- I/O control unit
- LAN access unit
- language unit
- line terminal unit
- logical unit
- magnetic-core storage unit
- magnetic tape unit
- mains unit
- make-contact unit
- matching unit
- matrix unit
- maximum transmission unit
- measurement unit
- medium attachment unit
- memory unit
- memory management unit
- microcontrol unit
- microprocessing unit
- microprocessor unit
- microprocessor control unit
- microprocessor-controlled unit
- microprogrammed unit
- MKS units
- mobile TV unit
- modular unit
- motor unit
- movable-head disk unit
- multiple unit
- multiplier unit
- multiply/accumulate unit
- multipoint control unit
- multistation access unit
- near-eye unit
- nerve unit
- network interface unit
- neural-like unit
- neuromotor unit
- numeric processing unit
- observation unit
- off-line unit
- on-line unit
- orderwire unit
- output unit
- paged memory management unit
- parallel arithmetic unit
- perceptual unit
- peripheral unit
- peripheral interface unit
- peripheral processing unit
- permanent storage unit
- piezoelectric-crystal unit
- pluggable unit
- plug-in unit
- processing unit
- processor unit
- producer's desk unit
- program-control unit
- protected data unit
- protocol data unit
- prototype unit
- quartz-crystal unit
- radio channel unit
- random-access storage unit
- reader unit
- read-write unit
- receptor unit
- recording unit
- register, arithmetic and logic unit
- reproducing unit
- reserve unit
- resistor-capacitor unit
- response unit
- reverberation unit
- sample unit
- sampling unit
- satellite delay compensation unit
- secure access unit
- secure telephone unit
- self-contained unit
- semantic unit
- sensory unit
- serial arithmetic unit
- service unit
- service protocol unit
- shaker unit
- SI units
- six-head tape-loop echo-reverberation unit
- slide unit
- spare unit
- standby unit
- start unit
- stop unit
- storage unit
- summing unit
- system processing unit
- tape unit
- telecine unit
- terminal unit
- terminal-control unit
- terminal-interchange unit
- time-base unit
- time processor unit
- timing unit
- traffic unit
- translation unit
- transmission control unit
- trichromatic unit
- tuning unit
- turntable unit
- ultimate sampling unit
- visual display unit
- voice-response unit
- volume unit
- winning unit
- wire-stripping unit
- word-processing unit
- writing unit -
3 Zworykin, Vladimir Kosma
[br]b. 30 July 1889 Mourum (near Moscow), Russiad. 29 July 1982 New York City, New York, USA[br]Russian (naturalized American 1924) television pioneer who invented the iconoscope and kinescope television camera and display tubes.[br]Zworykin studied engineering at the Institute of Technology in St Petersburg under Boris Rosing, assisting the latter with his early experiments with television. After graduating in 1912, he spent a time doing X-ray research at the Collège de France in Paris before returning to join the Russian Marconi Company, initially in St Petersburg and then in Moscow. On the outbreak of war in 1917, he joined the Russian Army Signal Corps, but when the war ended in the chaos of the Revolution he set off on his travels, ending up in the USA, where he joined the Westinghouse Corporation. There, in 1923, he filed the first of many patents for a complete system of electronic television, including one for an all-electronic scanning pick-up tube that he called the iconoscope. In 1924 he became a US citizen and invented the kinescope, a hard-vacuum cathode ray tube (CRT) for the display of television pictures, and the following year he patented a camera tube with a mosaic of photoelectric elements and gave a demonstration of still-picture TV. In 1926 he was awarded a PhD by the University of Pittsburgh and in 1928 he was granted a patent for a colour TV system.In 1929 he embarked on a tour of Europe to study TV developments; on his return he joined the Radio Corporation of America (RCA) as Director of the Electronics Research Group, first at Camden and then Princeton, New Jersey. Securing a budget to develop an improved CRT picture tube, he soon produced a kinescope with a hard vacuum, an indirectly heated cathode, a signal-modulation grid and electrostatic focusing. In 1933 an improved iconoscope camera tube was produced, and under his direction RCA went on to produce other improved types of camera tube, including the image iconoscope, the orthicon and image orthicon and the vidicon. The secondary-emission effect used in many of these tubes was also used in a scintillation radiation counter. In 1941 he was responsible for the development of the first industrial electron microscope, but for most of the Second World War he directed work concerned with radar, aircraft fire-control and TV-guided missiles.After the war he worked for a time on high-speed memories and medical electronics, becoming Vice-President and Technical Consultant in 1947. He "retired" from RCA and was made an honorary vice-president in 1954, but he retained an office and continued to work there almost up until his death; he also served as Director of the Rockefeller Institute for Medical Research from 1954 until 1962.[br]Principal Honours and DistinctionsZworykin received some twenty-seven awards and honours for his contributions to television engineering and medical electronics, including the Institution of Electrical Engineers Faraday Medal 1965; US Medal of Science 1966; and the US National Hall of Fame 1977.Bibliography29 December 1923, US patent no. 2,141, 059 (the original iconoscope patent; finally granted in December 1938!).13 July 1925, US patent no. 1,691, 324 (colour television system).1930, with D.E.Wilson, Photocells and Their Applications, New York: Wiley. 1934, "The iconoscope. A modern version of the electric eye". Proceedings of theInstitute of Radio Engineers 22:16.1946, Electron Optics and the Electron Microscope.1940, with G.A.Morton, Television; revised 1954.1949, with E.G.Ramberg, Photoelectricity and Its Applications. 1958, Television in Science and Industry.Further ReadingJ.H.Udelson, 1982, The Great Television Race: History of the Television Industry 1925– 41: University of Alabama Press.KFBiographical history of technology > Zworykin, Vladimir Kosma
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4 pass
1. I1) see people (a procession, a motorcade, the marching soldiers, etc.) pass видеть, как проходят люди и т.д.; the road is too narrow for two cars to pass дорога слишком узка, и две машины по ней не разъедутся; let me pass пропустите меня; will you kindly allow me to pass разрешите /дайте/ мне, пожалуйста, пройти; I heard someone passing я слышал, как кто-то прошел мимо2) let the remark (the words, the insult, etc.) pass не придавать значения замечанию и т.д., пропускать замечание мимо ушей; I don't like it, but I'll let it pass мне это не нравится, но я не стану обращать внимания /буду смотреть [на это] сквозь пальцы/; he should not have said it, but let it pass ему бы не следовало этого говорить, но бог с ним; we can't let that pass мы не можем этого допустить3) time (a fortnight, the day, etc.) passed время и т.д. прошло; а week passed миновала неделя; in the garden I don't notice time passing работая в саду, я не замечаю, как идет время4) all things pass нет ничего вечного; kingdoms and nations pass королевства и народы становятся историей; customs pass обычаи уходят в прошлое; the pain (his anger, the passion, etc.) has passed боль и т.д. прошла /утихла/; the crisis has passed кризис миновал5) the bill (this measure, the proposition, etc.) will pass этот законопроект и т.д. пройдет /будет принят/; they new tax bill passed and became a law новый проект закона о налогах был утвержден и вступил в силу6) it is not very good, but it will pass это не очень хорошо [сделано], но сойдет7) of the twenty who took the exam only twelve passed из двадцата сдававших выдержали экзамен только двенадцать8) strange things came to pass произошли /случились/ странные вещи; did you see what was passing? вы видели, что происходило /делалось/?9) I had very poor cards and decided to pass у меня были очень плохие карты, и я решил пасовать2. II1) pass in some manner pass quickly (slowly, noisily, etc.) быстро и т.д. проходить или проезжать мимо; pass first (last) проходить первым (последним); pass somewhere pass to and fro двигаться /ходить/ взад и вперед; pass in and out входить и выходить; pass ahead проходить /двигаться/ вперед; pass on продвигаться дальше /вперед/, не останавливаясь2) pass in some manner years (days, hours, etc.) pass quickly [by] годы и т.д. быстро летят; pass at some time the time for action had already passed время действовать уже прошло; weeks have passed since then с тех пор прошло много недель3) pass in some time the pain (his anger, the passion, her charm, etc.) will soon (gradually, etc.) pass боль и т.д. скоро и т.д. пройдет /исчезнет/3. III1) pass smth. pass the post office (smb.'s house, the gates, a station, a big truck, the place where it happened, etc.) проходить или проезжать мимо почты и т.д.; pass an ocean (a desert, a frontier, etc.) пересекать океан и т.д.; pass a river переправляться через реку; pass a bridge переходить или переезжать мост; pass the mountains (a range of hills, etc.) перевалить через горы и т.д.; the ship passed the channel пароход миновал канал; we passed our turning мы проехали наш поворот; we passed their car мы обогнали их машину2) pass smth. not a word (no sound, no complaint, etc.) passed her lips она не проронила ни слова и т.д.; no food has passed her lips у нее и крошки во рту не было3) pass smb. pass the visitors (the delegation, the children, etc.) пропускать посетителей и т.д.4) pass smth. pass these pages (this chapter, the preface, this paragraph, etc.) пропускать /опускать/ эти страницы и т.д.5) pass smth. pass the salt (the butter, the bread, the mustard, etc.) передавать соль и т.д.; pass bad money распространять фальшивые деньги и т.д.; pass a forged note (a worthless check, etc.) всучить фальшивый /поддельный/ вексель и т.д.; pass the ball передавать /пасовать/ или отбивать мяч || pass the chair сложить с себя обязанности председателя; pass the word передавать приказание6) pass smth. pass a quiet night (the worst day of his life, etc.) провести спокойную ночь и т.д.; pass the time проводить время7) pass smth. pass a bill (a law, a scheme of arrangement, a resolution, etc.) принять законопроект и т.д.; the new law passed the city council новый закон утвержден /принят/ городским советом8) pass smth. pass a test (a written examination, Latin, a subject, etc.) выдерживать [проверочные] испытания и т.д.9) pass smb. pass a student пропустить студента (на экзамене); поставить зачет студенту; принять экзамен у студента; pass a group of applicants признать группу претендентов годной; pass a candidate утвердить кандидатуру; I am passing the whole class я ставлю зачет всему классу; the board of censors passed the play (the film, etc.) цензура пропустила эту пьесу и т.д.; pass the censor (the customs, etc.) проходить цензуру и т.д.; he passed his medical coll. он прошел медицинский осмотр10) pass smth. pass smb.'s understanding /smb.'s comprehension/ быть выше чьего-л. понимания; pass all bounds переходить все границы, не знать меры /границ/; his strange story passed belief в странную историю, рассказанную им, невозможно было поверить; the splendour of the palace passed anything before or since великолепие дворца затмило все виденное и дотоле и потом4. IV1) pass smth., smb. at some time pass the bank (the office, etc.) every day ежедневно проходить мимо банка и т.д.; have we passed the station yet? мы уже проехали станцию?; pass smb. just now только что встретить или пройти мимо кого-л.; pass smth. in some manner pass the dangerous section of the road successfully благополучно миновать опасный участок дороги2) pass smb. somewhere pass smb. in впускать кого-л.; pass smb. out выпускать кого-л.3) pass smth. somewhere pass a year abroad (the day at home, etc.) провести год за границей и т.д.; pass smth. in some manner pass a few hours profitably с пользой провести несколько часик; how shall we pass the time (the evening, etc.)? как нам провести /скоротать/ время и т.д.?4) pass smth. in some manner pass a resolution unanimously единогласно принять резолюцию; pass a bill (a law, etc.) on the second vote принять закон и т.д. при повторном голосовании5. Vpass smb. smth. pass him the salt (your neighbour this book, me the water, her the letter, etc.) передайте ему соль и т.д.6. VIIIpass smth. doing smth. pass most of his time (days, many hours, etc.) fishing (painting, talking, etc.) проводить большую часть времени и т.д. за рыбной ловлей и т.д.7. Xpass in some state usually in the negative his remark (the fact, etc.) passed unnoticed /unobserved/ (unmentioned, etc.) его замечание и т.д. осталось незамеченным и т.д.8. XI1) be passed somewhere all the people were passed over the river всех [людей] переправили через реку; the old coin was passed around the room for everyone to see старинная монета обошла всех в комнате, и все могли ее рассмотреть2) be passed by smb. the play (the film, etc.) was passed by the censor пьеса и т.д. прошла цензуру; be passed as smth. he passed as A on his physical examination при медицинском освидетельствовании он получил группу А9. XVI1) pass by (between, across, over, under, etc.) smth., smb. pass by the door (by the shop, by me, etc.) проходить мимо двери и т.д.; pass between smb., smth. проходить между кем-л., чем-л.; the road passes near the lake дорога проходит недалеко от озера; he passed into the room он прошел в комнату; the poison has passed into his system яд проник в [его] организм; pass across the street (across the bridge, across the field, etc.) переходить /пересекать/ улицу и т.д.; pass along the street (along the beach, etc.) идти /проходить/ по улице и т.д.; the current is passing along the wire ток проходит /идет/ по проводам; pass over an obstacle /over a hurdle/ брать препятствие; the cloud passed over the river туча прошла над рекой; pass under the arch of a bridge (under the building, under the river, etc.) проходить под сводом моста и т.д.; pass through all Europe (through the whole country, through a village, through the garden, through the canal, etc.) проходить через всю Европу и т.д.; а line passes through a given point линия проходит через данную точку; we were passing through the forest мы проезжали через лес, мы ехали лесом; pass out of /beyond, from/ smth. pass out of (beyond the bounds of) sight /from smb.'s view/ скрыться из виду, оказаться вне пределов /за пределами/ видимости; pass out of (beyond the bounds of) hearing выйти за пределы /оказаться за пределами/ слышимости; pass beyond the bounds of gravity выйти за пределы /оказаться вне пределов/ земного притяжения, преодолеть земное притяжение; he passed beyond the bounds of law закон на него более не распространялся; pass from smb. to smb. pass from person to person (from one boy to another, etc.) переходить от человека к человеку и т.д.; the letter passed from one to another until everyone had read it письмо переходило из рук в руки, пока все не прочли его; pass from smth. to smth. pass from one place to another (from one subject to another, etc.) переходить с места на место и т.д.; pass from house to house (from hand to hand, etc.) переходить из дома в дом и т.д.; pass from mouth to mouth переходить из уст в уста; pass between smb. many letters passed between them они написали друг другу множество писем, они обменялись многочисленными посланиями2) pass across (over, etc.) smth. a blush passed across her face у нее вспыхнуло лицо; а change passed over his face у него изменилось выражение лица; а smile passed over her lips на ее лице промелькнула улыбка; an idea /а thought/ passed through my mind у меня в голове промелькнула мысль3) pass over smth. pass over smb.'s rudeness (over smb.'s conduct, over smb.'s offence, over smb.'s neglect, etc.) спускать кому-л. грубость и т.д.; pass over smb.'s faults закрывать глаза на чьи-л. недостатки; my advice passed entirely over his head он пропустил мимо ушей мой совет, не обратил никакого внимания на мой совет; he passed over the details он опустил подробности, он пренебрег подробностями; just pass over the first part of his letter опустите /пропустите, не читайте/ начало его письма4) pass to smb., smth. pass to his heir (to a member of the same family, to other hands, to his children, etc.) переходить [во владение] к его наследнику и т.д.; pass from smb. to smb. the title to the house passed from father to son право на владение домом /на дом/ перешло от отца к сыну; pass to smth. pass ing to the next point /item/ переходя к следующему вопросу; pass into (out of) smth. pass into smb.'s hands (into smb.'s possession, etc.) переходить в чьи-л. руки и т.д.; he didn't want the estate to pass out of his hands он не хотел, чтобы имение перешло в другие руки5) pass into (out of /from/) smth. pass into steam (into liquid, etc.) переходить /превращаться/ в пар и т.д.; pass into law (into an axiom, etc.) становиться законом и т.д.; pass into history становиться достоянием истории; pass into a proverb становиться поговоркой, превращаться в поговорку; days passed into weeks дни складывались в недели; pass into nothingness превращаться в ничто, исчезать; pass into general use (into circulation, into a new phase, etc.) переходить в общее пользование и т.д.; pass into disuse выйти из употребления; pass into silence замолчать, смолкнуть; pass into oblivion быть преданным забвению, кануть в вечность; pass out of fashion /out of style/ (out of current use, etc.) выйти из моды и т.д.; pass out of existence прекратить существование; the book passed out of print весь тираж книги распродан /разошелся/; pass from /out of/ memory /from smb.'s mind/ (по)забыться, улетучиться из памяти; pass from one state to another переходить из одного состояния в другое; pass from smth., to smth. pass from words to blows (from thought to action, from rage to despair, etc.) переходить от брани к драке и т.д.; pass from triumph to triumph идти от триумфа и триумфу: the weather passed suddenly from cold to hot холод неожиданно сменился жарой6) pass through smth. pass through many trials (through hard times, through a terrible experience, through many changes, through various adventures, etc.) пережить много испытаний и т.д., пройти через многочисленные испытания и т.д., we have passed through Ibis crisis мы пережили этот кризис; this book has passed through many editions эта книга выдержала много изданий7) pass in smth. pass in an examination выдержать /сдать/ экзамен; he didn't pass in geography он не сдал географию; pass without smth. he passed without a hitch он прошел гладко /без сучка без задоринки/ (на экзамене)8) pass between smb. nothing passed between them между ними ничего не произошло; sharp words passed between them между ними произошла ссора, они поссорились /поругались/9) pass for smb., smth. pass for a great scholar (for a learned man. for a liberal, for a hero, for a rich man, etc.) считаться /слыть/ большим ученым и т.д.; they could have passed for sisters их можно было принять за сестер; it might pass for silk это может сойти за шелк; it passes for slang это считается жаргоном; pass under the пате of... pass under the name of Black быть известным под фамилией Блэк10) pass (up)on smb., smth. pass on each contestant оценить каждого участника состязания, дать оценку каждому участнику состязания; pass on the authenticity of the drawing вынести суждение /высказать мнение/ по поводу того, является ли рисунок подлинником; the court dismissed the case without passing upon it суд отклонил иск без разбирательства дела10. XX1pass as smth. pass as an ancient relic (as relics from Pompeii, as an authentic text, as a first edition, etc.) сойти за древнюю реликвию и т.д.11. XXI11) pass smb., smth. in (on, etc.) smth. pass the man in the street (each other on the road, the girl on the stairs, a village on one's way, etc.) пройти мимо этого человека на улице и т.д.2) pass smth. across (over, around, etc.) smth. pass one's hand across one's forehead (across one's eyes, etc.) провести рукой по лбу и т.д., pass a sponge over the blackboard (a cloth over the table, etc.) провести губкой по доске и т.д., стереть губкой с доски и т.д.; pass a rope around /about/ the waist for support обвязаться веревкой для страховки; pass a rope round the barrel (round the box, etc.) обвязать бочку и т.д. веревкой; pass a rope round smb.'s neck накинуть петлю на чью-л. шею || pass one's eye over smth. взглянуть на что-л.; will you, please, pass your eye over this note? взгляните, пожалуйста, на эту записку; pass smth. through smth. pass a rope through a hole (a string through a ring, etc.) пропустить /протянуть/ канат через отверстие и т.д.; pass a thread through a needle вдеть нитку в иголку; pass smth. through a fine sieve просеять что-л. через тонкое сито; pass smth. between smth. pass one's hand between the bars просунуть руку через решетку3) pass smb. through smth. we'll pass them through this gate мы их пропустим в эти ворота; they passed me through the customs меня подвергли таможенному досмотру4) pass smth. to smb. pass a glass (the mustard, the salt, etc.) to your neighbour (to me, etc.) передавать стакан и т.д. соседу и т.д.; pass smth. (a)round (over, etc.) smth. pass the pie (the bottle, the tea, etc.) (a)round the table обносить всех сидящих за столом пирогом и т.д.; he passed her letter over my head он передал ее письмо у меня над головой; pass smth. from smth. pass a book from the shelf подать книгу с полки; pass a ring from hand to hand передавать кольцо из рук в руки; pass with. out of smth. pass a suitcase out of a window передать чемодан через окне; pass smth. over smth. pass rumours (gossip, the news, etc.) all over the village распространять /разносить/слухи и т.д. по всей деревне5) pass time in some place pass the winter in the south проводить зиму на Юге; pass time in smth. pass one's time in idleness жить в безделье /в праздности/; pass time with smb. pass a week (a few days, etc.) with the children (with him, etc.) провести неделю и т.д. с детьми и т.д.6) pass smth. through smth. pass a resolution (a measure, a bill, etc.) through a committee (through Senate, etc.) провести резолюцию и т.д. через комитет и т.д.7) pass smth. on smb. pass sentence /judgement/ on a criminal (on guilty persons, etc.) выносить приговор преступнику и т.д.; pass smth. on smth. pass criticism /remarks/ on smb.'s paper делать критические замечания по чьей-л. работе; I can't pass an opinion on your work without seeing it я не видел вашей работы и не могу высказать мнения о ней12. XXII1) pass smth., smb. without doing smth. pass the town (the place, the spot, etc.) without stopping проехать через город и не остановиться /не задержаться/ [в нем]; pass her without noticing (without looking, etc.) пройти мимо нее, не обратив [на нее] внимания и т.д.; pass him without smiling пройти мимо него без улыбки; pass them without saying "hello" пройти мимо них, не поздоровавшись2) pass smth. in doing smth. pass one's time in reading (in painting, etc.) проводить время за чтением и т.д.13. XXIV2the doctor passed him as fit врач признал его годным14. XXIV3pass smth. as being of some quality pass accounts as correct признать счета правильными -
5 Snellen, Hermann
[br]b. 18 February 1834 Zeist, near Utrecht, the Netherlandsd. 18 January 1908 Utrecht, the Netherlands[br]Dutch ophthalmologist who developed scientifically based visual testing types.[br]Snellen took his degree in medicine at Utrecht in 1857, and after continued study was appointed Lecturer in Ophthalmology and Surgeon to the Hospital for Diseases of the Eye. In 1877 he succeeded Franciscus Cornelius Donders, an outstanding figure in the development of the understanding of the optics and physiology of vision, as Professor. He held this post until 1899 when he was succeeded by his son.Although involved in virtually all aspects of the speciality, he particularly laid the basis for the scientific recording of visual acuity with the publication of his Optotypes in 1862. Optotypes were based on the concept of an average standard of vision permitting the discrimination of separate objects which subtended an angle of one minute of arc on the retina. While the concept does not take into account aspects of vision such as perception, it has stood the test of time in terms of practicality, even when abstract figures such as Landolt's rings replace the lines of single letters of the original.Snellen originated many other advances of a surgical nature, his procedure for eyelid deformity is still practised, and he developed the use of glass in the manufacture of artificial eyes.[br]Principal Honours and DistinctionsHonorary Member and Bowman Lecturer, Ophthalmological Society, UK.Bibliography1862, Optotypes/Ad visum determinandum, Utrecht. 1874, Des Functionem Sprungen.1862, Scala tipografica per mesurare il visus.Numerous papers in Graefes Archiv für Augenkinde and the Graefe-Saemisch Handbuch.Further ReadingS.Duke-Elder, 1969, System of Ophthalmology, London. 1973, The Foundations of Ophthalmology, Vol. 5.MG
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