. The principles and practice of roentgenological technique . sistance and switch. f. Motor start switch. g. Ground. h. Main switch (motor run). i. Motor field winding. j. IMotor starting winding. k. Coolidge transformer primary. 1. \oltmeter rectifier. m. Ammeter rectifier. n. High-tension rectifiers. o. Coolidge trar^sformer (secondary). p. High-tension transformer priraarj. q. Service leads. A flexible and sensitive Coolidge control isbuilt into the machine, and is operated bv thesmall knob immediateh over the main control is supplied from the main con-verter unit, thus eliminat
. The principles and practice of roentgenological technique . sistance and switch. f. Motor start switch. g. Ground. h. Main switch (motor run). i. Motor field winding. j. IMotor starting winding. k. Coolidge transformer primary. 1. \oltmeter rectifier. m. Ammeter rectifier. n. High-tension rectifiers. o. Coolidge trar^sformer (secondary). p. High-tension transformer priraarj. q. Service leads. A flexible and sensitive Coolidge control isbuilt into the machine, and is operated bv thesmall knob immediateh over the main control is supplied from the main con-verter unit, thus eliminating the additionalwires so commonly used when operating aCoolidge tube with the ordinary machine. Inthis type of transformer the entire sine waveis utilized. CHAPTER IVPORTABLE INDUCTION APPARATUS \\here the apparatus is to be carried out-side of the laboratory it should be compact,of small bulk and suited to the direct andalternating currents. A Tesla coil and a tubefitted with a mechanical interrupter especiallydevised for diminishins; inverse is a use-. Fic. 54.—Portable coil connected to storage batterieswith control box. The free positive terminal ofthe battery is connected to the positive wiringof the coil circuit. The tube stand is mountedon the cover of the coil box which also carriesstand and the valve tubes. ful form. In this apparatus, the alternatingcurrent is stepped up to about 2000 volts. Thischarges a condenser which discharges at ahigh-frequency through a few turns of wirewound outside a secondary consisting of manyturns of fine wire. A current of very highfrequency is thus generated. \\here no current is available, the ener-gizing current may be obtained froiu storagebatteries, or a dynamo. Batteries should becapable of delivering twenty-four volts and beof at least thirty ampere hour capacity, pre-ferably of forty-eight. A twelve inch coil withheavy primary is suitable to this currentand with a rotary mercury or a mechan-ical interrupter and condenser makes
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