The new method of transmitting photographs by radio, which the engineers of the Radio Corporation have worked out, is briefly described as follows:
The picture to be sent is photographed, and the developed film is attached to a revolving cylinder of glass. Inside the cylinder is an incandescent lamp the beam from which passes through the film with varying intensity according as parts of the family are light or dark. The beam is then focused by a lens on a sensitive photo-electric cell called the “eye,” which transform the light waves into electrical waves that after they have been amplified in a series of vacuum tubes can be transmitted by radio. The high-power electric energy that leaves the antenna of the sending action station is broken up by an ingenious mechanism into impulses like dots and dashing, corresponding to the longer or shorter waves transmitted by the “eye.”
At the receiving station the impulses are again amplified and translated back into the black and white of a picture. A piece of paper is wrapped around a revolving cylinder like that on which the original film was placed. A specially contrived fountain pen bears against the paper, and the electric current that has come across the ocean controls the pen and causes it to reproduce on the paper longer or shorter marks that correspond to the length of the electric impulses transmitted by the sending station.
From page 2 of the Concord Daily Tribune, Monday, Jan. 5, 1925
newspapers.digitalnc.org/lccn/sn92073201/1925-01-05/ed-1/seq-2/
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