Patent GB-190526595-A (GB)
Title: Improvements in Apparatus for Electric Signalling.
Inventor: BROWN ARTHUR GEORGE
Filed: 1905-12-20
Granted: 1906-12-06
Abstract: 26,595. B row n, A. G., and Brown, A. W. Dec. 20. Signals, electric-lamp, bell, indicator or visible, and reply.-An apparatus for signalling electrically between any two or more points is stated to be applicable to signalling between railway trains and cabins, between guards and drivers of trains, between the bridge of a ship and the engine-room, and between the top and bottom of a mine shaft. The transmitter consists of a multiple-contact pole-changing switch which is held in its operated positions by a latch magnet in the signal circuit, and the receiver consists of one or more polarized electro-magnets which have also unpolarized armatures. The signals may be indicated by lamps or disks. The operator at the receiver can annul any signal and return the transmitting- switch to normal by opening the signal circuit and connecting a second battery across the line-wires. Modifications are described by which the signal may be retransmitted to a third station; Fig. 4 shows one form of transmitter in which the drum 25 carrying contact-plates is engaged by the pin 29 on the handle 28, by which it is turned to either operative position. The pin 29 is then disengaged by the shoulders 30, and the drum is held in its new position by the attraction of the magnet 36 on the bar 37. Fig. 5 shows the connexion of the battery 35 through the reversing-switch to the lines e, i and the receiver magnets 8, 9, which have a polarized armature controlled by the magnet 24, which completes one of the contacts 21, 22 and lights one of the lamps from the battery 53. The .non-polarized armature 12 serves to break the circuit of the centre lamp at the contact 14 when any signal is transmitted. The switch 23 serves to break the signal circuit, thus restoring both armatures of the receiver to normal and allowing the transmitter to return also under the action of springs, and contact between the switch arm 23 and the block 39 impresses the voltage of the battery 53 across the line-wires and the' bell f, which calls the operator's attention. Fig. 3 shows a modified receiver in which the disk marked " S " is moved by the non-polarized armature, which is pivoted to turn on end-bearings; a disk marked "P C " is rocked to expose either signal according to the direction of the current. A modification of the apparatus shown in Fig. 5 enables the operator at the receiver to send a signal to a third station when the first station has signalled to the second, and a further modification ensures that the same signal is sent on which was received. In both case, the non-polarized armature serves to connect the battery at the second station to the transmitting-switch. The number of line-wires may be increased and the transmitting-switch modified to send currents along various combinations of the line-wires to energize a number of receiving magnets of similar character to that described with reference to Fig. 5, the contacts made by these magnets being connected in series with one another and with one of a set of lamps for indicating the signal transmitted.