Patent GB-659319-A (GB)
Title: Improvements in or relating to apparatus for recording signals made by ship's telegraphs
IPC: G08B9/04
Filed: 1949-01-28
Abstract: 659,319. Order-telegraph signalling systems; electric selective signalling systems. DOK-EN WERF-MAATSCHAPPIJ WILTON-FIJENOORD N. V. Jan. 28, 1949, No. 2480. Convention date, Jan. 30, 1948. [Classes 40 (i) and 118 (ii)] [Also in Groups XIX and XX] An apparatus for recording the signals made by the bridge and engine telegraphs 1, 2 of a ship employs a camera 12 to photograph an indicating device 4 repeating the signals. The indicating device is in the form of a drum with its periphery, Fig. 4 (not shown), inscribed with all signals capable of being made by the telegraphs. The drum is set into rotation when a signal is made by a telegraph, the bridge telegraph 1, say, and displays the signals in succession through an aperture 11 upon which is focused the camera, the camera being operated only when the particular signal made by the telegraph 1 appears in the aperture. Control of the camera is effected by a relay mechanism B energized when a selected circuit (see below) is established between a multi-point switch c, the arm of which is positioned by the telegraph, and a similar multi-point rotary contacter 21, 23 carried by the drum shaft. Alteration of the relay armature 16 actuates the camera shutter through levers 17, 18, 19, and also opens a contact b2 connected in the supply circuit allowing the apparatus to reset in readiness to record a subsequent signal. The relay armature in releasing operates the film-winding mechanism 19a to advance the film by one picture. The drum and camera may come under the control of either telegraph, a similar multi-point switch c1, rotary contacter 22, 24 and camera operating relay B1 being provided for the engine telegraph 2. To ensure that the signals are recorded in their proper sequence, the circuit connection established by one telegraph cannot be completed to the camera relay until the recording of a previous signal made by the other telegraph is completed. This is effected by a sequencecontrol relay having contacts v1 and v2 connected in the respective camera relay circuits. The relay is operated when a signal is made by either telegraph and breaks the circuit to the other telegraph camera relay until recording is completed. The rotation of the drum is controlled by electric motor 5 acting through a Geneva wheel device, Fig. 2 (not shown), arranged to impart an intermittent rotary motion to the drum whereby each signal remains stationary in the aperture 11 for <SP>1</SP>/ 10 th of a second. The exposure time of the camera is <SP>1</SP>/ 20 th of a second. Starting of the motor when a signal is made is controlled by multi-point switches a and b together with relays D and G in the case of the bridge telegraph and similar switches and relays a1, b1, D1, G1 in the case of the engine telegraph. A multi-point switch in having its arm positioned by the engine control hand wheel 42 is connected in circuit with switch m having its arm positioned by the engine telegraph, the circuit established by the switches being included in that of camera operating relay B1. This arrangement ensures that a signal sent by the engine telegraph is not recorded until the engine control hand wheel has in fact been moved to carry out the order. Relay S connected in parallel with relay B1 controls a warning lamp 38. In addition to recording the signal, the camera photographs a serial number indicator N, operated by contacts b1 or b11 on the camera operating relays, a clock and a tachometer coupled to the engine shaft. Electric selective signalling systems.-Bridge telegraph 1 positions the arm of multi-point switch c on a contact corresponding to the order made and thereby extends a circuit through an associated slip ring I-IX on the shaft of drum 4 to the correspondingly numbered segment of rotary contactor 21. Each segment corresponds to an order on the drum periphery and is arranged to engage a stationary brush 23 when that order appears in window 11. The arrangement is such that when the order made by the telegraph appears in the window a circuit is completed from the arm of multi-point switch c (energized from the +VE supply over previously prepared circuits) through the slip ring and rotary contactor to brush 23 and thence via leads 30 and 31 to the camera operating relay B. The circuit including multi-point switch c1, rotary contactor 22 and camera relay B1 functions in an identical manner for the engine telegraph 2.