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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tarising from the mercury is extremely irritatingin those in which oil is not used. Motor Vibrator. This is another type of me-chanical interrupter, where, instead of usingmercury to interrupt the current, the current isbroken between two silver or platinum contacts,which are usually about half an inch in diameter.These surfaces are brought in contact and sepa-rated again by means of a cam attached to theshaft of an ordinary electric motor, which isoperated by a separate and distinct current fromthat used to go through the primary of the induc-tion coil. The advantage of this type of inter-rupter over the mercury-jet is that it is verymuch easier to keep in good working order, takes The Coil and Accessories 29 up very little room and can be operated at avery much slower rate of interruption. It alsohas the additional advantage of being muchcheaper. (See Fig. 8.) Ordinary Vibrator Type of Mechanical Inter-rupter. This is constructed on the same general MI on fi_ __1_(lQ £L£CTRICMOTOR
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Fig. 8.—Motor Circuit Breaker. When the electric motor is in operation, it causes the section E tomove back and forth so that the current is made broken between thetwo large contact surfaces D and E. This operates very satis-factorily with currents of not more than five or six amperes. plan as the vibrator used on the ordinary f aradicmedical coil, the only difference being that it isvery much larger, and instead of small contactpoints they are made at least half an inch indiameter, the same as on the interrupter abovedescribed. This makes the simplest type ofmechanical interrupter, but, like the mercury 30 X-Ray and High-Frequency Currents interrupter, it can not be operated at as slowa rate as the one run by the separate motor.(See Fig. 9.) Electrolytic interrupters. These depend fortheir efficiency upon the decomposition of sul-

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