High Frequency Apparatus Page 116

116 HIGH FREQUENCY APPARATUS eral diagnostic work as the potential is sufficient to break down an air gap of four inches which is sufficient to excite the average six-inch X-ray tube of moderate vacuum. The outfit described is preferable to the transformer apparatus in the event that nothing but direct current is available in the vicinity. No rotary converter is necessary and if the physician chances to be in a neighboring town where alternating current is unexpectedly found, the apparatus is equal to the emergency. For dentists this outfit is exceptionally well adapted. Fig. 3. Powerful portable outfit comprising both kicking coil and transformer for use on either direct or alternating current circuits It is excellent for the treatment of diseases of the oral cavity and in addition it will make good radiographs of the jaws with comparatively short exposure. Large Portable Outfits.-Fig. 3 illustrates an outfit of the highest grade which combines the features of portability, reliability, and general utility to a degree not approached by the smaller outfits. The price of this equipment is $185.00 when arranged for both alternating and direct current use.