Transactions of the Society of Motion Picture Engineers (1928)

Record Details:

Title:
Transactions of the Society of Motion Picture Engineers
Date:
1928
Publisher:
New York : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1928)
Leaf #:
000946
Language:
English
Subjects:
motion pictures, Cinematography -- Periodicals
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Preceeded by an unnumbered issue published in 1916 called: Incorporation and by-laws
Date Added:
February 15, 2024
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924 Transactions of S.M.P.E., Vol. XII, No. 36, 1928 When such a device is placed in the dark, no current can pass across the evacuated space between the electrodes. If, however, light is allowed to fall upon the cathode, it emits electrons which are drawn across the space to the anode and so an electric current flows through the circuit. All metals have this property <2> Fig. 2. Diagrammatic representation of the elements of a photo-electric cell. of emitting electrons to a greater or lesser degree, but the effect is particularly marked in the case of the alkali metals. In Fig. 3 is shown a rather common type of photo cell. It consists of a glass bulb silvered on the inner wall. Contact is made with the silver surface by means of a platinum flush seal which Fig. 3. Photo-electric Cell. is brought out to the little cap. The silver merely serves as a conducting background which is coated with a thin layer of one of the alkali metals, Li, Na, K, Rb, Cs, which are particularly photo sensitive. This takes the place of the zinc plate of Hallwachs' experiments. The anode in this case consists of a pair of wires, the details of which I will return to later. A circular window at one side serves for the admission of the light. The details of con