. Dental and oral radiography : a text book for students and practitioners of dentistry . Fig. high frequency coil. then carried to a condenser. As the currentleaves the condenser it is oscillating at a greatrate of frequency and passes into the primary of X-RAY MACHINES 57. Fig. type high frequency coil. 58 DENTAL AND ORAL RADIOGRAPHY the Tesla or second coil where it induces a cur-rent in the s lary of this coil From the ter-minals of the last secondary, it is carried to thex-ray tube. The principles involved in this type apparatus are shown in Fig. 17. Like the curr
. Dental and oral radiography : a text book for students and practitioners of dentistry . Fig. high frequency coil. then carried to a condenser. As the currentleaves the condenser it is oscillating at a greatrate of frequency and passes into the primary of X-RAY MACHINES 57. Fig. type high frequency coil. 58 DENTAL AND ORAL RADIOGRAPHY the Tesla or second coil where it induces a cur-rent in the s lary of this coil From the ter-minals of the last secondary, it is carried to thex-ray tube. The principles involved in this type apparatus are shown in Fig. 17. Like the current of the induction coil, the cur-rent from the Tesla coil is high in voltage andlow in amperage, but unlike the current from theinduction coil it is not uni-directional, but is al-ternating in character. Fur this reason, it is con-g ered by some as being less desirable for radi-ographic purposes. However this apparently ob-jectionable feature is overcome by using an x-raytube constructed in such a way as to cut out onewave of the current and thereby produce practi-cally the same result as where an uni-directionalcurrent is used. These coils have the advantage of being lesscumbersome, require less space and are less ex-pensive than the other form of apparatus, but theycannot be dep
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