Identifier: practicalpointsi00judd (find matches)
Title: Practical points in the use of X-ray and high-frequency currents
Year: 1909 (1900s)
Authors: Judd, Aspinwall
Subjects: X-rays Electrotherapeutics Radiography X-Rays Radiography
Publisher: New York : Rebman Company
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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esla coil, while soft iron is used for theprimary core in the Rhumkorff. Again, the pri-mary is usually outside the secondary in theTesla and inside in the Rhumkorff. The insu-lation in the Tesla between primary and sec-ondary, which is more or less incomplete, is aglass cylinder, and the secondary consists onlyof a single winding of wire. (See Fig. 18, Dia-gram of Tesla coil.) Oudins resonator is simply a cylinder abouteight inches in diameter and twenty in length.Around this a copper wire is wound and one endof it connected to the dArsonval solenoid. Theother end is free, and from it, when the appara-tus is in action, a fine electric spray or effluve High-Frequency Apparatus 53 is given off under a much higher potential thanthe original current. This effluve can then beconducted to any part that one may desire tolocally affect. This current is of higher poten-tial than the dArsonval current. The Large Solenoid. This is rather a cum-brous piece of apparatus, and on that account =rO O
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Fig. 19.—Oudin Resonatoe. Doctor Oudin found that by connecting the large solenoid of dArsonvalto one terminal of the small solenoid of dArsonval, from the top ofthe large solenoid he would obtain a long spark, which varied accord-ing to the point of contact from the large solenoid on to the smallsolenoid. In order to make this more convenient, he designed anapparatus as shown in Fig. 22. not very greatly used at the present time. Itconsists of a helix cage (dArsonval) somethinglike a mouse-trap, of size sufficient to contain aman, connected to the small solenoid by meansof a wire, or a spiral placed at the top of thelarge solenoid (Piffard). It is usually attachedby means of a pulley and rope to the ceiling, so 54 X-Ray and High-Frequency Currents that it can be raised and lowered to admit thepatient. (See Fig. 20, Solenoid.) The Auto-Condensation Couch usually con-sists of a table with insulated legs, upon whichis placed a woven wire screen or mattress. Onewire from the dArsonval

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