Evening Republican, Volume 23, Number 312, Rensselaer, Jasper County, 31 December 1920 — PHOTOS SENT BY TELEPHONE WIRE [ARTICLE]

PHOTOS SENT BY TELEPHONE WIRE

Demonstration of Teleostereograph, a French Invention, ' Proves Success. EFFICIENCY SHOWN IN TESTS l 1 Four Picture* Are Sent From New York to St. Louis, the Negatives Being Reproduced With Distinctness. New York. —The first American demonstration of the teleostereograph, the Invention of Edouard Belin of Paris, Was held when four photographs were Wired between this city and St. Louts. Each of the pictures went the 1,000 miles in about eight minutes, the negatives being reproduced with distinctness. The tests were between the office of the World and the editorial rooms of the St. Louis Post Dispatch and were conducted by Mr. Belin who came to New York at the Invitation of Ralph Pulltzef, proprietor of the World. Efficiency Is Demonstrated. “The instrument has demonstrated Its efficiency and utility,’’ Mr. Pulitzer said after the experiment, “and I am quite satisfied with the tests." “Do you Jntend to introduce the teleostereograph in American journalism?” he was asked. “Well, I am hoping to,” he said, “but of course it has not quite reached the practical stage yet.” About seventy-five scientists, wireexperts and newspaper men gathered to witness the trial. Mr. Belin and several assistants had the instrument all set up and special wires between the two cities were waiting. “The transmission," declared A. C. Lescarboura, scientific writer, “Is simply a matter of preparing a basreltef of the photograph, and then tracing that basrelief with a stylus connected to a telephone transmitter. The latter varies the current flowing over the wire In accordance with the relative height of any point of the basrelief

record at any given moment. At the receiving end this current variation is translated into various- gradations of light. “The first step, then, Is to prepare the transmitting record or plate. A copper cylinder forms the base of the record—which, Incidentally, is of the size -'and appearance of the old fashioned phonograph records —and its surface is coated with a five per cent shellac sblution. Care of the PrinL “Meanwhile a carbon print is made tn the conventional photographic manner from the photographic negative to be transmitted, after which the print Is wrapped face to face with the shel-

lacked copper cylinder. The cylinder With the print is then placed in hot water, with the result that the gelatin of the print adheres to the cylinder accordance with its own degree of blackness, while the unexposed gelatine Is washed away with the paper. “In this manner a coating of uneven thickness is formed on the cylinder, or a photographic basrelief.”