. Elementary and dental radiography / by Howard Riley Raper . Fig. 32. A, iron core. B, iron core with primary winding. C, iron core, primary winding and , iron core, primary winding, insulation and secondary winding. Now let us consider the high-frequency )iflb-Trequency (Figs. 14 and 35.) In mechanical construction theColl. high-frequency coil may be considered a kind of double coil with the secondary of the first coil act-ing as the primary of the second coil. The primary current of the firstcoil should be 34 ELEMEXTARY RADIOGRAPHY From the supply wire the current pas
. Elementary and dental radiography / by Howard Riley Raper . Fig. 32. A, iron core. B, iron core with primary winding. C, iron core, primary winding and , iron core, primary winding, insulation and secondary winding. Now let us consider the high-frequency )iflb-Trequency (Figs. 14 and 35.) In mechanical construction theColl. high-frequency coil may be considered a kind of double coil with the secondary of the first coil act-ing as the primary of the second coil. The primary current of the firstcoil should be 34 ELEMEXTARY RADIOGRAPHY From the supply wire the current passes through the primary wind-ing of a step-up transformer (first coil) at the usual commercial ioo to125 volts. 60-cycle. (Fig. 35.) An alternating current of the samefrequency as the primary, but higher in voltage and lower in amperageis generated in the secondary of the transformer, and passes into thecondenser, which acts as a reservoir. As the current leaves the condenserand jumps the regulating spark gap. it is oscillating at a frequency of. Fig. 33 Cross-section diagram of induction coil. A. iron core. B, primary winding. C, insulation. D. secondary winding. from to more than a million. It passes through the primary wind-ing of the Tesla coil, inducing a secondary current of the same highfrequency. This Tesla coil is the same as an induction coil ( Figs. $2 and33), except that some inert substance, instead of soft iron, is used forthe core. The secondary current of the second coil is the one supplied by themachine, the one to be used to generate X-rays. Like the current of theRuhmkorft, or induction coil, this current is high in voltage and low inamperage. The current of the induction coil is. however, practically auni-directional one, while the current supplied by the high-frequency coilis alternating at the inconceivably high frequency of tens of thousandsor millions. Hence the term high frequency. which is applied to thecurrent and the coil producing it. The fre
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