GB299355A - An improved system of and apparatus for the telegraphic or telephonic transmission and reception of messages - Google Patents

Abstract

299,355. Prior, W. Oct. 24, 1927. [Convention date]. Void [Published under Sect. 91 of the Acts]. Perforated strip transmitters; secret telegraphy. -Cable code signals are stored in condensers at a telegraph transmitting station, and sent out in irregular order, and are re-arranged in the original order after storage in condensers at the receiving station. The system is stated to be applicable also to telephony and wireless signalling. At the transmitter the fingers 12 make contact through perforations in a tape (not shown), with the segments of a cylindrical commutator 7, pins 17 on the commutator engaging the guide holes in the tape. All segments numbered 1 in the diagram are connected to the slip-ring 1 and so to one plate of the condenser 1, the other plate of which is earthed, and the parts numbered 2 - - 6 are similarly connected together. The segments of the first and third 6-segment groups are numbered consecutively, while those of the second and fourth groups are numbered in the irregular order 2, 1, 4, 3, 6, 5. Positive and negative impulses are therefore stored in the condensers through the brushes 12 in one order and discharged to line through the brush 13 in Mother order. A similar arrangement is adopted at the receiving station (Fig. 3, not shown), for restoring the correct order of the signals; a recorder is connected to the brush 13, the line is connected to a brush 12 and the tape is omitted.