File:Practical electro-therapeutics and X-ray therapy - with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray (1912) (14753953521).jpg

Identifier: practicalelectro00mart (find matches)
Title: Practical electro-therapeutics and X-ray therapy : with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray
Year: 1912 (1910s)
Authors: Martin, James Madison, 1866-1947
Subjects: Electrotherapeutics X-rays Diagnosis, Radioscopic Eye Electric Stimulation Therapy X-Ray Therapy Ophthalmologic Surgical Procedures
Publisher: St. Louis : C.V. Mosby
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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piece of lead wire in thefuse block would burn out and the current could no longer enter thecoil. From the negative wire the current enters the primary of thecoil, which surrounds a soft iron core, acting as a magnet. Emerg-ing from the primary, the current passes through the rheostat,which measures the current strength; then through the rheostat,which controls the current; then to the electrolytic inter- 190 PRACTICAL ELECTRO-THERAPEUTICS AND X-RAY THERAPY rcipter, and back to the main circuit again. The secondary wind-ing of the coil is connected with the sliding rods of the Leydenjars. When these rods are brought close enough together to allowsparks to pass between them, rapid oscillations take place betweenthe jars, at the same time producing a current between the outsidecoating of the jars through the coil connecting them. This currentis alternating in character, and because of its rapid change in di-rection, millions per second, it is called a high-frequency current, Oudin coil
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Fig. 99.-—Outline of the Oudin resonator. From the DArsonval apparatus it is only a step to the Oudin.If one end of a solenoid or coil is connected to one end of the D Ar-sonval coil, a current of an entirely different character will beproduced. This combination of the second coil with a DArsonvalcoil is known as an Oudin resonator. Figure 98 shows the firststep in this arrangement. Oudin found that, by regulating the HIGH-FREQUENCY CURRENTS 191 number of turns in the DArsonval coil he was able to regulate thedischarge from the terminal of the secondary coil. Figure 99roughly illustrates the present plan of the Ouclin resonator, asshown complete in Figure 31. In the Oudin resonator the drum A is wound with two sizes ofwire; the lower six or eight turns are made of coarse wire, aboutNo. 8 or 10, while the remaining greater portion of the drum iswound with about No. 20. The upper end of the coarse wire coilis soldered fast to the lower end of the small wire coil, while theupper end of

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