The advance of photography : its history and modern applications (1911)

Record Details:

Title:
The advance of photography : its history and modern applications
Date:
1911
Publisher:
London : K. Paul, Trench, Trübner & Co., Ltd.
Volume:
The advance of photography : its history and modern applications
Leaf #:
000458
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
May 02, 2024
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362 THE ADVANCE OF PHOTOGRAPHY attached to two fine silver wires which are free to move laterally in a strong magnetic field when the current received passes through the silver wires. The stronger the current the more movement will this piece of foil exhibit. It is so arranged that the amount of light which has access to the prepared film Pivot on the receiving cylinder shall be gauged entirely by the degree of movement of the foil, and hence by the amount of current passing through the circuit, which in its turn depends upon the resistance of the selenium cell, or, in other words, on the density of the photographic film on the transmitting cylinder. To send a picture by this method takes from ten to twelve minutes, hence as the cylinder rotates twelve times per minute there will be one hundred and forty four lines in the photograph received , which lines form a spiral thread round the film on the receiving cylinder. When this film is developed and laid open, the picture will become apparent owing to the varying thicknesses of the lines on the film. Fig. 163 shows a photograph transmitted by the Kom process. Another method in which the carbon process plays an L Platinum Wheel. I& 19 20 Fig. 162.