. Elementary and dental radiography / by Howard Riley Raper . Fig. 13. Induction or Ruhmkorff coil. should be done according to this rating. The amount of amperage neces-sary to operate a coil varies directly according to the size of the coil—the larger the coil the more amperes it takes. Assuming the coil to beof a medium large size, the lead wires used to connect it to the mainsshould be capable of carrying at least 30 amperes without heating. Bylead wires I mean the wires leading to the machine—not lead (themetal) wires. The wires are copper. X-RAY MAC MIXES 17 Somewhere near where the wire
. Elementary and dental radiography / by Howard Riley Raper . Fig. 13. Induction or Ruhmkorff coil. should be done according to this rating. The amount of amperage neces-sary to operate a coil varies directly according to the size of the coil—the larger the coil the more amperes it takes. Assuming the coil to beof a medium large size, the lead wires used to connect it to the mainsshould be capable of carrying at least 30 amperes without heating. Bylead wires I mean the wires leading to the machine—not lead (themetal) wires. The wires are copper. X-RAY MAC MIXES 17 Somewhere near where the wires enter theTurn. building, and also at the coil itself, will be found fuses. (Fig. 18.) A fuse is a wire, an alloy oflead, of a given size, and fusing point, capable of carrying only a limitedamperage without melting. Thus, if more than 30 amperes be sentthrough a 30-ampere fuse, the wire is heated to its fusing point, it melts,the circuit is broken, and the flow of electricity is stopped. A fuse is a. Fig. 14. High-frequency coil. sort of safety valve. About 30 ampere fuses should be used for a mediumlarge induction coil. This information, however, will always be givenby the manufacturers of the coil. Somewhere near where the wires enter the build-Switches, ing, and also at the coil, are placed switches. Anelectric switch (Fig. 19) is an appliance for throw-ing the electric current into, and out of an extended or auxiliary circuit. Assuming that the current at our disposal is it must first bepassed through an interrupter. An interrupter is an electric apparatus by meansInterrupters. of which a constant current is converted into an in- terrupted one. Interrupters are of three kinds: (1)The electrolytic, Fig. 20; (2) the mercury turbine, Fig. 21, and (3) themechanical or vibrator, Fig. 22. For picture work, in connection with the induction coil, the elec-trolytic, or, as it is sometimes called in honor of the inventor, the Weh-nelt interrupter, is quite the best. With
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