The talkies (1930)

Record Details:

Title:
The talkies
Date:
1930
Publisher:
London: Crosby Lockwood and Son
Volume:
The talkies
Leaf #:
00087
Language:
English
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
March 28, 2024
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THE TALKIES 53 all speeds of vibration, imparting to sounds false characteristics, and among other things giving a husky character to music, which is anything but pleasant. It is not surprising to learn, therefore, that it is not selenium that the giant 2-ton Talkie projectors obey to-day, but another type of "photo cell," which, instead of merely altering the resistance it offers to an electric current, actually creates one whose strength varies in sympathy with the strength of the light falling on it. To get the broad idea of how these cells are used in reproducing the sound from the film, we need only turn back to Lauste's specification and substitute a "photo cell" for the selenium which he experimented with and mentions in his specification : When such record is made we reproduce it by causing light to pass through that portion of the medium [film] containing the record of the impressions [the picture] and so project them on to the screen simultaneously causing light to pass through that portion of the medium [film] containing the record of the sound to a cell of selenium [now a photo cell], or other suitable substance by which the varying degrees of light and shade of the record [film] are [re] converted into correspondingly varying electric currents which are . . . converted [transformed] into sound vibrations by a suitable vibrating medium [the loudspeakers].