. "Roentgen" induction coils and other X-ray apparatus . Figure ii. Direct Current Motor=Generators. THE Motor-Generator above shown is designed to transform theno, 220 or 500 volts direct current down to 20 volts directcurrent, which latter current is the one supplied directly to theinduction coil. Little Inverse When the comparatively low voltage supplied by Discharge, one of these machines is fed to the induction coil the inverse discharge with its annoying blackening of tubes is ata minimum as well as the current consumed from the service mains. The economy of maintenance accompanying the
. "Roentgen" induction coils and other X-ray apparatus . Figure ii. Direct Current Motor=Generators. THE Motor-Generator above shown is designed to transform theno, 220 or 500 volts direct current down to 20 volts directcurrent, which latter current is the one supplied directly to theinduction coil. Little Inverse When the comparatively low voltage supplied by Discharge, one of these machines is fed to the induction coil the inverse discharge with its annoying blackening of tubes is ata minimum as well as the current consumed from the service mains. The economy of maintenance accompanying the use of a motor-generator over that obtained with storage batteries should be seriouslyconsidered when the mechanical interrupter is installed. Direct Current Motor=Generators, With secondary output of 200 watts at 20 volts. Price. B3070. To operate from no volts direct current $ B3071. 220 B3072. 500 * James G. Biddle, 1114 Chestnut Street, Philadelphia. Motor=Generators. 19. HOLTZER-CABOT ELFXTRIC CO. ROSTON, MASS, hIGURE 12. Alternating Current Motor=Generators. nU SATISFACTORY and reliable Alternating Current Motor-Gen-Iri erator is necessary when the alternating current is to be used ^— in conjunction with a mechanical or other direct current in-terrupter. We recommend the form here shown as thoroughly reliable andsatisfactory. It transforms the commercial alternating current to 20 volts directcurrent, furnishing the same kind of current to be used in the induc-tion coil as is delivered by the Direct Current Motor-Generator shownon the preceding page. In ordering an Alternating Current Motor-Generator it is neces-sary to specify the voltage and frequency of the alternating current tobe used. Alternating Current Motor = Generators. Commercial Voltage. Secondary Voltage. Watts Output. Price. B3073. noB3074. 220B3075. noB3076. 220 20 202020 275275 $ 20 James G. Biddle, 1114 Chestnut Street, Philadelphia. Storage Batteries. KALEVI
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