GB284717A - An electro-magnetic device permitting the practical realisation of television - Google Patents

Abstract

284,717. Thurm, L. Feb. 5, 1927, [Convention date]. Television apparatus; copying-telegraphs.-In a copying-telegraph the object is explored by a plurality of photo-electric cells 1 each producing a record on a steel band 4, and the bands are subsequently connected in sequence to a transmitter. At the receiving-station the processes take place in the reverse order. Each cell explores only a portion of the image, which is explored completely by the set of cells, and photoelectric currents after amplification at 2 pass to an electromagnet 3 which makes the record on the band. The bands or wires are in the shape of a spiral and are so held by a disc 4<a>. The bands mav be so mounted that a record can be made on both sides of the discs (Figs. 4 and 5, not shown). The records then travel successively, in given order, between the poles of an electromagnet which occupies the usual place of a microphone in a transmitting station, thus modulating the emitted waves (Fig. 6, not shown). At the receiving end metallic bands are sent, synchronously with those at the transmitting end, between the poles of an electromagnet which occupies the usual place of a telephone or loudspeaker in an ordinary receiving set (Fig. 7, not shown). The records so produced travel simultaneously, in an arrangement similar to that shown, between the poles of electromagnets in circuits the currents of which, after amplification, act on optical devices which reproduce the image, for example on a screen.