Patent GB-190517308-A (GB)
Title: A New or Improved Apparatus for Producing Electrical Discharges.
Inventor: HADDAN HERBERT JOHN
Filed: 1905-08-26
Granted: 1906-08-02
Abstract: 17.308. Haddan, H. J., [Synchronous Static Co.]. Aug. 26. Electric appliances; light, treating diseases with.- Relates to apparatus for producing electric discharges of high frequency and intensity for X-ray, medical, and other purposes, such as the production of violet light rays, in which alternating or direct current can be used. In the arrangement of apparatus shown in Fig. 1, the electro-magnet device 1 receives continuous or alternating current from the supply wires 2, 3, and produces discontinuous impulses of higher potential, which charge the condenser 4, the discharge current passing through the primary 5 of the sparking-coil 6. The switch 9 in the position shown makes the necessary connexions for using alternating current, and in the position shown in dotted lines for the use of continuous current. The interrupter consists of a spring 36, attached to the armature 13, and carrying two contacts 28, 29 opposite contacts 30, 31 in the condenser discharge circuit. In order that the armature 13 may vibrate in synchronism with the alternations of the current, it is mounted on a ribbon 40, the tension of which may be varied by the arm 43 and screw 44. When alternating current is used, the coils 14, 15 of the device 1 are connected in parallel, one circuit including the interrupter, current passing from the lead 2 through the switch 11, wire 23, switch arm 16, wire 19, coil 14, wire 20, arm 17, and the rheostat 10 to the lead 3, and also from the lead 2 through the wire 32, contacts 30, 28, spring 36, contacts 29, 31, wires 33,34, arm 18, wire 25, coil 15, and the rheostat 10 to the lead 3. The magnetic oscillations in the core 12 result in electric oscillations in the condenser circuit, these impulses passing from the lead 2 through wires 32, 38 and the primary 5 to the condenser 4, wire 34, arm 18, wire 25, coil 15, rheostat 10, and the lead 3. At the moment that the condenser has thus been charged, the armature 13 allows the interrupter to close the discharge circuit from the condenser 4 through the wire 33, contacts 31, 29, 28, 30, wire 38, and the coil 5. When continuous current is used, the switch 9 is placed in the position shown in dotted lines, the coils 14, 15 being thus placed in series. Current then passes from the lead 2, wire 32, terminals 30, 28, 29, 31, wires 33, 34, arm 18, wire 19, coil 14, wire 20, arm 17, wire 25, coil 15, and the rheostat 10 to the lead 3. The interruption of the current produces an impulse which charges the condenser passing from the lead 2, wires 32, 38, condenser 4, wire 34, arm 18, wire 19, and the coils 14, 15 as before to the lead 3. The condenser discharge circuit is the same as before. To reduce the inductance of the discharge circuit, the wires and coil 5 are formed of conducting tube. In the modified form of apparatus shown in Fig. 2, the coils 14,15 are wound on separate cores 12, 12<1>, the coil 15 being divided into sections connected to contacts 46 engaged by the sliding contact 47. The induction coil 5, 6 comprises two disk-shaped secondary coils 6, with their outer edges in close proximity and the primary coil surrounding both secondaries and with its sides curved in as shown in Fig. 2. The secondaries are wound spirally and have their outer ends connected to the ends of the primary coil.