Patent GB-190701548-A (GB)
Title: Improvements in or relating to Telautographic Systems.
Inventor: KORN ARTHUR
Filed: 1907-01-21
Granted: 1907-08-22
Abstract: 1548. Korn, A. Jan. 21. Telegraphs.-In a telautograph system, the receiving-galvanometer consists of one or two currentcarrying stretched conductors, mounted in a magnetic field and supporting an interceptor for controlling the passage of light to a sensitized film, which is arranged on a cylinder revolving synchronously with the transmitting-cylinder on which the message &c. is written in insulating-ink. Fig. 2 is an horizontal section through one form of receiving - galvanometer in which two wires 15, 16, carrying the interceptor 17, are mounted between the poles of the permanent magnet 1, which is provided with holes 2 to allow light to pass through the instrument. The wooden frame 3 has fixed and adjustable metal straps 5, 10, respectively, carrying pins 6, 12 to which the ends of the wires 15, 16 are attached. The line current passes from the line 19 through the wires 15, 16 in parallel, to the other line terminal connected to the strap 10. The tension of the wires 15, 16 can be adjusted by a winged nut 14. A single thin metallic strip or ribbon may replace the two wires 15, 16. The interceptor 17 may be a hollow ball or any other shape, but is preferably a small thin plate of small mass. Fig. 6 shows the receiving-apparatus as a whole. The light from the lamp 46 is brought to a focus by a lens 47 at a point in the plane of the interceptor 17, and then passes through lenses 42, 43 and a small opening 41, falling on sensitized paper 50 on the cylinder 22, which is rotated by clock-work 25, receiving a small axial motion from a feed-screw 21. The transmitting-apparatus is similar to the receiving- apparatus, the galvanometer and optical arrangements being replaced by a single style, which normally completes the line circuit but is caused to break this circuit when a part of the message, written in insulating-ink on metal foil, passes under the style. Fig. 8 shows the electric connexions between the two stations. When the transmitting-style 51 completes the line circuit, current passes from the batteries 57, 60 through the cylinder 22, style 51, line-wire 63, resistance 62, and batteries 60, 57 back to the cylinder 22. Part of the current also passes through the wire 19, galvanometer wires 15, 16, and wire 18. This current deflects the wires 15, 16 to such an extent that the interceptor prevents passage of light to the sensitized paper. When the line circuit is interrupted by the insulating-ink, the current through the wires 15, 16 is reduced, and the interceptor falls to its lower position and allows light to fall on the sensitized paper. In a modified system, the battery 60 is dispensed with, a small battery being inserted in the conductor 18. In a further modification, the battery 60 and connexion 61 are dispensed with, the wires 15, 16 being in a simple series circuit with the line-wires. A so-called negative photograph of the original message may be obtained by arranging the light rays to fall normally on the sensitized paper, but to be cut off when the transmitting-style passes over the insulating-ink.