A system of electrotherapeutics as taught by the International correspondence schools, Scranton, . -plementary armature that revolves in the magnetic field of themotor and has an alternating E. M. F. produced in it, suitablefor the operation of the transformer shown in Fig. 6. In Fig. 7is a diagram showing the connections of the motor-generatorwith the lighting circuit, transformer, and cautery. A is thecurrent-tap, inserted in any lamp-socket, from which the con-ductors a, a transmit a 110-volt current to the motor brushes ofthe motor-generator B, setting its armature in rotation. An alt
A system of electrotherapeutics as taught by the International correspondence schools, Scranton, . -plementary armature that revolves in the magnetic field of themotor and has an alternating E. M. F. produced in it, suitablefor the operation of the transformer shown in Fig. 6. In Fig. 7is a diagram showing the connections of the motor-generatorwith the lighting circuit, transformer, and cautery. A is thecurrent-tap, inserted in any lamp-socket, from which the con-ductors a, a transmit a 110-volt current to the motor brushes ofthe motor-generator B, setting its armature in rotation. An alter-nating current of 70 volts is then taken from the collector-ringson the left side of B and sent through the conductors b, b to the 20 PHYSICS OF LIGHT AND CAUTERY §17 transformer C, where it is changed into a 6-volt alternating cur-rent, with a corresponding increase in amperage. This currentis now led through the conductors c, c to the cautery D. When buying apparatus of this class it is always advisable tospecify the voltage of the circuit from which it is intended to 110 Volts Direct Current. 6 Volts A/ternorinq Current Flo. 7 derive the operating current. The construction of the apparatusvaries with the variation in voltage. The motor can also beused for any other purpose where driving power is required,such as static machines, centrifuges, etc. CAUTERIES 24. In Art. 16 was explained the theory of the cautery, andit remains here to treat of its practical construction and of thevariations in form that the various purposes for which it is useddemand of it. Platinum is the metal that is almost exclusivelyused for cauteries, though at times thin steel and iron wires havebeen utilized for the same purpose. Platinum has the advan-tage over other metals that it is of a high specific resistance andlow specific heat, and of a high fusing temperature, thereforenot easily melted when exposed to a high temperature. §17 PHYSICS OF LIGHT AND CAUTERY 21 25. Construction of the Cauter
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