PHOTOGRAPHS BY TELEGRAPH.

Wairarapa Age, Volume XXVIII, Issue 7950, 27 January 1906, Page 7

PHOTOGRAPHS BY TELEGRAPH.

It is not long since we heard of •"wireless telegraph. The other day I read that a oombined phonograph •and kinematograpb is an accomplished fact. And now I read of photographs by telegraph. Read thia:— Tne well-known oleotrical inven tor, Professor Korn, delivered a • lecture at Munich recently before ' the members of the Electro-Teoh-ntoal Association, ' in which be described the progress mad« towards the perfection of the apparatus for transmitting photographs over telegraph .wires. Protessor Korn stated tba*. the problem of telegraphing photographs had been solved in principle, 'ibe apparatus will be ready fot general use when a few teohnioat improvements haveb een introduced. 'The experiments wbish the Professor bad already carried oat prove that it la possible to transmit a photograph or sketch, six or seven inches square In a period varying from 10 to 20 minutes. These experiments were 'carried., out on the telegraph line *rob Munich to Nuremberg, a distance of about 100 miles, but Professor Korn deolares that precisely %jte same results would be obtained ■it the. photographs were transmitted 'fey » telegraph line or submarine •Oable 5,000 miles in length. The photograph which has to be transmitted ia placed on a transparent glass cylinder, which revolves qalbwy, and at the same time moves from right to left. A ray of light is thrown on this cyliJder by mems of ■" -an.electric lamp and lens, and when the ray of light reaches the interior .-/of thecylinder it is brighter or . barker, according to the colouring 'Of that particular part of the ■photograph through which it passes. Inside the cylinder is some aele'mom, which.transmits the electrical .ronrrent in, proportion to the intensity of light brought to hear on it. sne selenium transmits the current itabre rapidly in a bright light, and 3esg rapidly aa the light decreases. The selenium within the oylinder ia!. connected with the wire over 'which the . photograph is to .be transmitted. " '' Thei receiving station consiscs of an electrical Nernst lamp placed inside a glass cylinder covered with paper. The Nernst lamp barns more ot less brightly according to the varying ourrent transmitted by • the selenium at the •other end. It thus reproduces the 'exact shade of the original photograph provided that the cylinders at.\eaob end of the. wire revolve <at'exactly the same speed. ■ The ''Professor has ascertained a simple means of regulating the revolution qf the oylindera so that the speed >ib identical at both ends. professor Koru staled that when the improvements on which he is ' -now working are introduced it will ;t» possible to transmit a photograph, or sketch of half a dozen inches square within five seconds, instead of 10 or 15 minutes.—Exchange.