Röntgen rays and electro-therapeutics - with chapters on radium and phototherapy (1910) (14571382440)

Identifier: rntgenrayselectr00kass (find matches)

Title: Röntgen rays and electro-therapeutics : with chapters on radium and phototherapy

Year: 1910 (1910s)

Authors: Kassabian, Mihran Krikor, 1870-1910

Subjects: Electrotherapeutics X-rays Phototherapy Radiology Radiotherapy

Publisher: Philadelphia & London : J.B. Lippincott Company

Contributing Library: Francis A. Countway Library of Medicine

Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

Text Appearing Before Image:

11.) In brief, it consists of two glass plates, the diameter of oneplate being slightly larger than the other. The plates, though in closerelationship, do not touch. The fixed plate contains two ^windows ^ Sylvanus Thompson, Elementary Lessons in Electricity and Magnetism, p. 63. 22 ELECTEO-THERAPEUTICS. directly opposite one another. Two bits of paper (field plates) are gluedto the stationary plate, one above the window on the left side, and onebelow the window on the right. From each of these pieces of paper atongue protrudes through each aperture, almost, but not quite touchingthe revolving plate. The plate is rotated in a direction opposite to thatin which the tongue projects. The prime conductor consists of twometallic combs, supported by brass rods with knobs, and mounted onglass supports. Two other brass knobs with ebonite handles and knobsform the discharging electrodes, through whose agency the spark lengthcan be varied. A neutralizing rod to minimize the reversal of polarity

Text Appearing After Image:

rm. 11.—Toepler-Holtz influence machine. is also provided. Before working the machine, one of the field platesmust be charged from an outside source and the knobs of the dischargingrods must be brought together. (c) The Voss or Toepler is more self-exciting than the Holtz, but isless sure in its action than the Wimshurst. The Yoss resembles the Holtzmachine in many details, but the moving plates carry a few sectors, andthese in their rotation touch a pair of brushes carried by two bent armswhich connect with the field plates, and so convey charges from the mov-ing plate to the armature of the fixed field plates. In this country thereare practically no Wimshurst machines used. They are nearly allToepler-Holtz machines, that is to say, Holtz machines modified so as to FEICTIONAL CUREENTS. 23 be self-exciting, as invented by Toepler. The Eastern manufacturers arelargely using the Holtz machines Avhicli are excited by a smaller genera-tor of the Wimshurst or Toepler type, while mostly a

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1910

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