Patent GB-136094-A (GB)
Title: Improvements relating to the Method of and Apparatus for Operating Cable or Ocean Telegraphy.
Inventor: ANGEL HERBERT
IPC: H04L25/49
Filed: 1919-05-14
Abstract: 136,094. Angel, H. May 14, 1919. Type-printing telegraphs; relays. - The transmitting arrangement of a type-printing telegraph system comprises a three-unit perforated strip transmitter of positive, negative and zero current impulses, the contacts of which are connected successively to transmitting relays; and a magnet for withdrawing the movable contacts of the transmitter from the strip and for feeding the strip. The receiving arrangement comprises a rotary distributor which together with relays controlled by the cable relay, transmit current impulses to the selecting relays and to a clear-out magnet which also controls the printing magnet. The segments of the distributor are so arranged that the impuises transmitted to the selecting relays occupy portions of the intervals of transmitted impulses at which these impulses have their best form. Overlap of the printing and setting operations is provided for, and the cable is grounded between the current impulses of a character. Transmitting arrangements. The stationary contact blocks a, b of the perforated strip transmitter are connected respectively to the negative and positive sides of a battery B, while the minus and plus movable contacts 1 are connected to a constant block 15<a>, the minus and plus contacts 2 to a contact block 15<b> and the minus and plus contacts 3 to a contact block 15<c> of a rotary distributor D. The tape is punched in such a manner that the connected movable contacts are not energized simultaneously. The impulses from the battery B are transmitted successively to the operating windings 20, 20<1> of the transmitting relays TR, TR' through the contact segments of ring S<2>, contact ring R<2>. and brush BR<2> of the distributor D, the windings 20, 20<1> being so arranged that the relay TR responds to negative current impulses and the relay TR<1> to positive current impulses. The relays TR, TR<1> are provided with continuously energized coils 23, 23<1>, which normally hold the relay tongues in the positions shown to earth the cable, and with locking coils 31, 31<1> which are energized from a battery 30 through the contact segments of ring S<1>, contact ring R', brush BR', and the tongue of the operated relay. The segments of ring S<1> and its contact blocks 16<a>, 16<b>, and 16<c> are arranged to maintain the locking circuits of the relays TR, TR' after the operating circuits of these relays have been broken by the brush BR<2>, thereby prolonging the signal impulses sent to line from the battery 30 by the operation of the relays. While the last impulse is being sent to line a brush BR<3> bridges the segments of ring S<3> and ring R<3> thereby energizing a magnet 17, which withdraws the operated contacts 1, 2, and 3 from the strip and also advances the strip. Receiving arrangements. The cable relay CR operates to energize selectively from a battery 40 the relays R<a>, R<b> in accordance with the nature of the received impulse. The relays R<a>, R<b> operate selectively relays CL, CL<1>, the windings 43, 43<1> of which are so arranged that one is operated by a negative current impulse and the other is operated by a positive current impulse. The relays CL, CL' are provided with windings 42, 42<1> which normally hold the relay tongues in the positions shown. Positive and negative impulses are sent successively from a battery 50 to the selecting relays R<1>, r<2> - - r<6> by the operation of the relays CL, CL<1> and the brush BR<4> of a rotary distributor D<@> which rotates in synchronism with the transmitting distributor D. The segments of the ring S", which are engaged by the brush BR<4>, are so arranged that the impulses transmitted occupy the portion of the interval of the transmitted impulses at which these impulses have their best form. The operating windings of the relays r<1>, r<4>, r<2>, r<5>, and r<3>, r<6> are connected in series respectively and are wound in opposite directions so that the relays r<1>, r<2> and r<3> are responsive to negative currents, and the relays r<4>, r<5> and r<6> to positive currents. The relays r<1>, r<2> - - r<6> are provided with locking windings the circuits of which are controlled by the relay tongues and by the tongue 45<1> of a cutout relay 45. The. relay 45 is energized through the segments of ring S<6>, ring R<5>, and brush BR<5> of the distributor D<1> after the relays r<1>, r<2> - - r<5> have been selectively energized, and the relay 45 also controls the circuit of a printing-magnet 46. During the printing operation, the impulses of the succeeding character are being received.