348,514. Totalizators. GRAHAM AMPLION, Ltd. and SCOWCROFT, J., St. Andrew's Works, Slough. Jan. 31, 1930, Nos. 3315, 4640, and 5747. [Class 106 (i).] The bet signals are transmitted over combination code lines a fixed number of which must necessarily always be marked. The lines are common to a number of ticket machines and means controlled by the revertive signals are provided for switching each machine in turn into electrical connection with the code lines. Control lines are also provided for diverting the signals to the particular registering switch corresponding with the class and value of the bets. The drawing illustrates the circuit arrangements for the first and last machines of the series while to the right are shown the relays relating to one counter. When the current is switched on, relay K of the first machine is energized through a line terminating at contact r<25> in the last machine. Contacts k therefore give the key contacts access to the eight code lines a .. h common to all the machines. Each key when depressed applies potential to a particular three of these lines and thus energizes corresponding decoding relays 24a .. 24h at the central station. The contacts of these relays are arranged as shown so that the energization of any three relays effects a connection from a positive pole to a particular line 25 leading to a horse registering-relay M. Class and value control wires. In each machine are switches 14, 15 adapted to be set to energize one or other line in two groups of lines leading to win and place relays respectively. The value of the bet is determined by the particular line in each group connected up and the lines lead to valueselecting relays L, L<1>, &c. adapted to divert the code signals to the desired set of decoding relays. Registering a bet. When the bet-signal passes to the relay M, a contact m completes circuit to the impulsing relay 26 and another contact m<1> causes one winding of a resetting relay N to operate a holding contact n which is in series with relay contact m<2> and also with contacts a<1> .. h<1> actuated by the corresponding decoding relays 24a .. 24h. Contact n<3> brings down the impulsing relay 26 so that the counter advances, and contact n<4> deenergizes the de-coding relays. The circuit to the registering relay M is broken at n<5> or at the interrupter contacts 126 of the impulsing relay 26 and finally the holding circuit for relay N is broken at m<2> or at the contacts a<1> .. h<1>. Revertive signal. Registering relay M when energized earths at m<3> a line 27 and thus causes one winding of a relay R at the ticket machine to operate a contact r<1> and, through the line r<31> terminating at the last ticket machine, effect full operation of the relay over both windings as soon as the earth on line 27 is removed. A contact r<2> thereupon switches the earth potential from a line terminating at the last machine (r<25>) from relay K to relay K<1> in the second machine, contact r<3> earths a line 32 to the last machine, and contact r<4> closes a circuit to a relay P. As relay K is now released, access to the code and control lines from the first machine is broken at k and k<1> and is given to the second machine. Precautionary arrangements. If when a machine is switched in no key therein is depressed the circuit through the second winding of relay R is shunted by a contact t<1> controlled by the keys. The relay R is therefore fully operated and switches in the next machine. The relay P is provided to prevent a second bet signal from being sent when a key is held depressed longer than the time taken to connect up all the ticket machines in rotation. While a key is depressed the relay P is kept excited through contacts p2, t2 and at p<5> breaks the betsignal control circuits. A contact p<4> also ensures the switching-in of the next machine, although relay R cannot operate. The relay P is slow to release and a contact p<1> in series with a key contact t<4> is inserted in a shunt to contact r<1> in order to prevent switching-off the succeeding relay K<1> and the energization again of relay K when the key is finally released. Consequently relay R is momentarily put in action to maintain the relay K<1> energized through contact r2. Last ticket-machine. The preliminary contact r<21> of the relay R<2> in this machine is in the line 32 to the contacts r3 of all the other machines so that relay R<2> remains energized while any of the other similar relays are active. When the last relay operates therefore it opens the line 31 at r<23> to bring down the other relays and is itself released by the opening of all contacts r<3> in the other machines. Specifications 333,258, [Class 106 (i), Calculating &c.], 340,508, and 346,378 are referred to. Reference has been directed by the Comptroller to Specifications 331,500, 331,518, [both in Class 106 (i), Calculating &c.], 340,298 and 342,518.