File:Elementary and dental radiography (1813) (14757123305).jpg

Identifier: elementarydenta00rape (find matches)
Title: Elementary and dental radiography
Year: 1813 (1810s)
Authors: Raper, Howard Riley
Subjects:
Publisher: New York : Consolidated Dental Mfg. Co.
Contributing Library: Dentistry - University of Toronto
Digitizing Sponsor: University of Toronto

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bCS. hig, and also at the coil, are placed switches. An electric switch (Fig. 19) is an appliance for throw-ing the electric current into, and out, of an extended or auxiliary circuit. Assuming that the current at our disposal is D.C.. it must first bepassed through an interrupter. .\n iukMTupter is an electric apparatus l)y meansInterrupters. of wliicli a constant current is converted into an in- terrupted one. Inlcrrupters are of three kinds: (i)The electrolytic, Fig. 20; (2) the mercury turliine. l-ig. 21, and (3) tliemechanical or vibrator, kig. 22. ¥(.)v picture work, in connection with the induction coil, the elec-trolytic, or, as it is sometimes called in honor of the inventor, the \\eh-nelt interrupter, is quite the best. With it the constant current may be i8 ELEMENTARY RADIOGRAPHY interrupted at the rate of from 60 to 30000 interruptions per minute.The mercury turbine gives from 200 to 3,600 interruptions per minute,and the vibrator from 250 to 1,000 interruptions a minute.
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I-ig. 15. Interrupterless coil. The electrolytic interrupter consists of a glass jar containing a solu-tion of sulphuric acid in water, the electrolyte, in which is immersed aplatinum point electrode, A (Fig. 20), and a lead electrode, B. Theplatinum is covered with a porcelain sheath, C, except for its point, whichprojects into the electrolyte. Little or much of the point may be exposedin the acid by the regulating arm, D. We have two wires now leading from the mains to our apparatus. X-RAV MACHINES 19 Of these one is the positive wire which brings the electric current, anrlthe other is the negative or return wire. The positive wire must be at-tached to the binding ))ost of the ))latin.um electrode, marked +. (Fig

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