A manual of practical medical electricity - the Röntgen rays and Finsen light (1902) (14781330114)

Identifier: manualofpractica00turn (find matches)

Title: A manual of practical medical electricity : the Röntgen rays and Finsen light

Year: 1902 (1900s)

Authors: Turner, Dawson

Subjects: X-Rays Electrophysiology Electrosurgery Electric Stimulation Therapy Electrotherapeutics X-rays Electrophysiology Electrosurgery

Publisher: New York : William Wood & Company

Contributing Library: Francis A. Countway Library of Medicine

Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Fig. 88.—Voliolinis Baitery. Electricity of High Potential and of Great Frequencyof Alternation. The electrical phenomena exhibited by Tesla and ElihuThompson are, from their physiological effects, not with-out much medical interest. These will be referred to High Potential Electricity 143 farther on, but a few simple remarks here about the physicsof the phenomena may be an advantage. The essential differences between the current that Teslauses and that furnished by an ordinary dynamo or induc-

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o tion coil are that the alternations of his current are in-conceivably rapid, and the E. M. F. exceedingly high.Thus the alternations produced by a good induction coilmaybe about 200 per second, and the E. M. F. from 500 144 A Manual of Practical Medical Electricity to 20,000 volts ; while the alternations of the current usedby Tesla vary from about half a million to ten or moremillions per second, and the E. M. F. from 100,000 to amillion or more volts. To produce these effects, Tesla makes use of an alter-nating current dynamo with a stationary armature aboutthirty inches in diameter, and provided with about 380coils. A thin disc of iron carrying 380 magnets connectedin series,;.and driven by a motor at 2,000 revolutions,

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1902

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