. Elementary and dental radiography . - S8 Three-cell rectirk 3° ELEMENTARY RADIOGRAPHY At each make and break of the circuit of the primary current,a current is induced in the secondary. The secondary current inducedai ;he break of the primary Hows in the same direction as the current inthe primary, while the current induced at the make flows in the oppositedirection. Thus the secondary is an alternating current; but the currentoi the make is SO much weaker than the current of the break that, forpractical purpose, the secondary may be considered a uni-directional, pul-. Fig. 39. Twenty-nine b
. Elementary and dental radiography . - S8 Three-cell rectirk 3° ELEMENTARY RADIOGRAPHY At each make and break of the circuit of the primary current,a current is induced in the secondary. The secondary current inducedai ;he break of the primary Hows in the same direction as the current inthe primary, while the current induced at the make flows in the oppositedirection. Thus the secondary is an alternating current; but the currentoi the make is SO much weaker than the current of the break that, forpractical purpose, the secondary may be considered a uni-directional, pul-. Fig. 39. Twenty-nine button rheostat. sating current. The current of the make is what is known as the inversecurrent, and it is the effort of all coil manufacturers to make a coil givinga> little inverse current as possible. The voltage of the secondary current cannot lie determined ac-curately. Authorities differ very greatly in their estimate of the numberof volts required to jump one inch of atmosphere, giving the figure aslow a- kkxx), and as high as 6o,000. What voltage is required to jump each succeeding inch after the fust, j^ also a question shrouded in very greal uncertainty. Estimating each inch of atmosphere at 10,000 volts, which perhapstting a- near the truth a- possible ai the present time, the voltage X-RAY MACHINES 31 furnished by any size coil can easily be determined. Figuring on thisbasis, an 8-inch coil in full operation supplies a current with a potentialof 80,000 volts; a 20-inch coil, 200,000 volts. The amperage, or, to be more exact, the milliamperage of the
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