. American X-ray journal . without a dryer to absorb or heaterto expel the moisture, providing acharger of adequate generating capacityis employed to bring it into primary ac-tion its plates will yield their full quotaof current, but the damp air will dissi-pate a portion of the energy, and in con-sequence of the low point of magneticsaturation of the atmosphere the con- the charger, and making connectionsaccordingly, a desired polarity may begiven to the instrument that is to beexcited. When, as is usually the case, themechanical propulsion of the staticmachine is effected by an electro-motor
. American X-ray journal . without a dryer to absorb or heaterto expel the moisture, providing acharger of adequate generating capacityis employed to bring it into primary ac-tion its plates will yield their full quotaof current, but the damp air will dissi-pate a portion of the energy, and in con-sequence of the low point of magneticsaturation of the atmosphere the con- the charger, and making connectionsaccordingly, a desired polarity may begiven to the instrument that is to beexcited. When, as is usually the case, themechanical propulsion of the staticmachine is effected by an electro-motoractuated by a direct commercial current,a rheostat for starting box and speedregulator is placed in a simple series. The rheostat is essentially composedof resisting iron wire coils, varyinglengths of which, by a selecting device,may be interposed in the circuit, causinga portion of the electrical energy to bedissipated in the form of heat. Othercoils of similar composition are placedin a special chamber in the base of the. A sixteen revolving pljdenser action of the machine and itselectrical output will be minimized. If,on the other hand, the case is thoroughlydried, a few turns of a small chargerwill suffice for its excitation and theelectrical output will be at a maximum. A small charger may be used to bringa larger exciter into action wheneverthe latter is required, but fails tooperate. The polarity of the Holtzmachine will correspond to that of theinstrument from which it obtains itscharge. Hence, by observing in thedarkened apartment the nature of thedischarge on the collecting combs of e, Holtz static machine,static machine, where they are employedfor drying purposes. Would it not beadvisable from an economical standpointto combine the two devices, using theheat of the rheostat to dry the interiorof the apparatus? This may be accom-plished in the following manner: Drawin your minds eye two pictures of theface of a clock, one on the base and rearside of the static machine
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