Patent GB-190521846-A (GB)
Title: Improvements in, and relating to, Electric Telegraphy.
Inventor: BARONIO ANGELO CIPRIANO
Filed: 1905-10-26
Granted: 1907-01-26
Abstract: 21,846. Baronio, A. C., and Muirhead, A. Oct. 26. Telegraphs.-Relates to the automatic transmission of messages by the use of perforated strip, the telegraphic code being in some cases of such a nature that each character, or biliteral syllable when such are employed, o c c u - pies the same space on the strip, the usual space for one unit between the characters being then unnecessary. The required number of different characters or syllables is obtained, while using a small number of signal elements per character, by using extra perforations adjacent to the normal perforations, the function of which is to cause a stronger current than normal to be sent to line. Fig. 1 shows a portion of strip having the usual feed perforations a, and dot' and 'dash' perforations b, b, and in addition the extra perforations c, the effect of which is to strengthen the line current. Fig. 4 shows a portion of siphon-recorder strip, the signals due to the strengthened currents being indicated at 24, 26. The apparatus may also be arranged so that instead of the stronger line current increasing the amplitude of the signal element recorded, a dot is printed opposite the normal signal element. At the receiving-station, the strip may be punched by apparatus controlled by the signals received, the strip being used either for retransmission or for actuating a typewriter such as is described in Specification No. 22,219, A.D. 1901, suitably modified in view of the extra perforations. Fig. 2 shows a preparing instrument for the strip shown in Fig. 1. The four punches u, v, w, x are controlled by the electro-magnets g, j, r, s, which are themselves controlled by the five keys d, e, f, g, h. The wiring is such that the space key d controls only the electro-magnet j of the 'central' or feed perforations, the keys g, e control the electro-magnets r, q of the dash' and dot' perforations, in addition to energizing the electro-magnet j, and the keys k,f control also the electro-magnet s for the ' extra' perforation. The automatic transmitter, which is controlled by the paper strip, is provided with the usual line' or ' earth' levers, which control a reversing switch for putting either the positive or the negative terminal of the battery to line, and a third lever is used for the purpose of throwing an extra battery into series with the main battery whenever the extra' perforation occurs. Fig. 5 shows receiving-apparatus comprising a moving- coil relay 27 with a five-part contact surface 29 ; a siphon recorder 36 which records the movements of the contact tongue on to the sections 30, 32 ; and electro-magnets 40, 41 which print dots on the record strip when the stronger line currents bring the relay tongue on to the sections 31, 33. The received message can be automatically retrans-. mitted by connecting the inner sections of the five-part contact plate with the electro-magnets of a reversing switch for controlling the omission of positive and negative currents to the outgoing line, and the outer sections with an electro-magnet which throws the extra battery into the circuit. The arrangement of apparatus shown in Fig. 7 is adopted when it is required to reproduce the perforated strip at the receiving-station. When the tongue of the receiving relay 27 is at rest on the central section 29 of the contact surface, the electro-magnet 64 is energized, the battery 67 then energizing the electro-magnet 69 and allowing the cam 74 to be continuously driven from the ratchet-wheel 73. The cam mechanism is similar to that described in Specification No. 13,472, A.D. 1900. Contact is made at 78 once in each revolution, and the electro-magnet 79 is consequently energized so as to operate the punch 81 for punching the 'central' perforations in the strip 82. When an impulse arrives from the cable, the electro-magnet 64 is de-energized, and the cam 74 ceases to rotate, but one of the electro-magnets 83 is now energized and the polarized 'sticking' relay 84 closes the circuit of the battery 67 through the corresponding electro-magnet 86, thereby releasing the cam 88 and bringing into action the electro-magnet 89 which effects a ' dash ' perforation, and also, owing to a collar 105 on the ' central' punch, effects at the same time the necessary' central' perforation. An opposite movement of the main relay tongue produces a 'dot' perforation. Whenever either a ' dot' or a 'dash' perforation is produced, the electro-magnet 94 is also energized, but this produces no effect unless the main relay tongue reaches the section 31 or 33, in which case the electro-magnet 97 is energized, and current flows through the contacts 68, 99, 96 so as to energize the electro-magnet 100 and punch the extra' perforation. Instead of perforating the strip, the apparatus may record impressions from stylographic points, or pencils &c.