photoelectric cell
71Color television — Title card for NBC, promoting their broadcast in RCA color . Color television is part of the history of television, the technology of television and practices associated with television s transmission of moving images in color video. In its most… …
72Brunswick Records — infobox record label image bg = black parent = Brunswick Records founded = 1916 distributor = Koch Entertainment (In the US) genre = Historic: Various Current: Soul music country = US url = http://brunswickrecords.com/Brunswick Records is a… …
73Vladimir K. Zworykin — Infobox Engineer name = Vladimir Kozmich Zworykin image size = caption = Vladimir Zworykin, 1929, holding his kinescope birth name = birth date = birth date|1889|7|30 birth place = Murom, Russian Empire death date = death date and… …
74Drum Buddy — Quintron playing Drum Buddy The Drum Buddy, invented by New Orleans Ninth Ward one man band Quintron, is a light activated oscillating drum machine which operates on the principles of an optical theremin. An electronic instrument developed in the …
75colorimetry — [kul΄ərim′ə trē] n. the analysis or measurement of color by means of a colorimeter colorimetric [kul΄ər ə me′trik] adj. colorimetrically adv. * * * See colorimetric. * * * Measurement of the intensity of electromagnetic radiation in the visible… …
76densitometer — densitometric /den si teuh me trik/, adj. densitometry, n. /den si tom i teuhr/, n. 1. Photog. an instrument for measuring the density of negatives. 2. a densimeter. [1900 05; DENSIT(Y) + O + METER] * * * ▪ instrument device that measures… …
77electron tube — an electronic device that consists, typically, of a sealed glass bulb containing two or more electrodes: used to generate, amplify, and rectify electric oscillations and alternating currents. Also called electronic tube. Cf. gas tube, vacuum tube …
78rotary press — Print. a printing press in which the type or plates to be printed are fastened upon a rotating cylinder and are impressed on a continuous roll of moving paper. [1925 30] * * * Printing press that prints on paper passing between a supporting… …
79scintillation counter — a device for detecting and measuring radioactivity, having a crystal scintillator, a photoelectric cell sensitive to the light from scintillations, and an amplifier. Also called scintillometer /sin tl om i teuhr/. [1945 50] * * * ▪ instrument… …
80Microscope — An optical instrument that augments the power of the eye to see small objects. The name microscope was coined by Johannes Faber (1574 1629) who in 1628 borrowed from the Greek to combined micro , small with skopein, to view. Although the first… …
