Abstract
AN abstract of a paper by C. F. Elwell in Journ. Inst. Electrical Eng., vol. 62, p. 231, briefly describes Dr. de Forest's methods of producing talking-motion-pictures. Telephonic currents are received in a two-electrode valve emitting highly actinic light. This is focussed on a slit, and a record is made on the edge of an ordinary film travelling at the usual rate of 12 to 18 inches per second. To reproduce the sounds, light passing through the developed film is received on a photoelectric cell, and weak currents are obtained and are amplified and passed to a telephone. Sound vibrations as high as 3000 per second are said to have been obtained.
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