Improvements in or relating to Means for the Electrical Transmission of Orders, Signals and the like

5648. Graham, E. A., and Rickets, W. J. March 6. Order and order-type apparatus. - In order apparatus of the kind in which a receiverpointer is rotated step by step by varying the direction of a resultant magnetic field, pairs of magnetic poles are energized by windings connected at one end to a point of potential midway between that of the supply mains, and at the other to a signalling-line which may be connected at pleasure to either of the mains. The rotations may be recorded on a counting- mechanism. A bell or other signal may call attention to the operation of the device, and several such devices may be used with the same supply mains for gunnery and like purposes. In the form shown in Fig. 1, the armature winding g and resistance h are in series across the mains i, j, and to their junction-point k are connected the pairs of windings m, n, p, r, leading by way of signalling-lines o, s to slip-rings t, u, which rotate together with the transmitter - pointer. By means of stationary brushes 1, 2, 3, 4, the slip-rings as they rotate are connected with the supply mains in successive different combinations, so that the pairs of poles at the receiver are magnetized separately or together in two senses, giving eight successive directions of the resultant field, which is followed by the armature f. In modifications, the resistance h may be omitted, the point k of middle potential being obtained by tapping the middle of the armature winding g ; or this winding may be independently energized, the point k being the middle point of the source of current or of a resistance h connected across the mains. In the latter case, the magnetizing-coils m, n, and p, r may alternatively be wound upon poles on an armature which rotates in the field of a permanent magnet, when the resistance h may either'be located in the transmitting-instrument so that only three line-wires are necessary, or be wound on the permanent magnet to assist its magnetization. The resistance h may also be used to actuate a single-stroke bell or other signal. For the latter purpose, and for avoiding waste of current means may be provided as shown in Fig. 9, where a handle 12 controlled by a spring 14 breaks a suitable circuit i, i' once in each revolution, and transmits a reduced rotation to the spindle 8 of the transmitter by means of Geneva-stop mechanism 10, 9. The brushes 19, 20 contact with a metal plate mounted on the disk 16, which thus completes the circuit, except when the handle 12 is in the