Practical radiography - a handbook for physicians, surgeons, and other users of X-rays (1901) (14754598461)

Identifier: practicalradiogr00isen (find matches)

Title: Practical radiography : a handbook for physicians, surgeons, and other users of X-rays

Year: 1901 (1900s)

Authors: Isenthal, A. W Ward, H. Snowden (Henry Snowden), 1865-1911

Subjects: Radiography X-rays X-rays Radiography X-Rays

Publisher: London : Published for The Photogram, Ltd. by Dawbarn and Ward, Ltd.

Contributing Library: Francis A. Countway Library of Medicine

Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

Text Appearing Before Image:

8+ Practical Radiography phases will be interrupted (or inductively employed) duringwhich the wire is positive, whilst the negative impulses ofthe current—though actually flowing—do not come to anexpression as far as inductive effect is concerned. Therehas been no difficulty in the authors hands in obtaining verynearly the full spark length from coils run under theseconditions, provided only that the coil did not contain initself too much self-induction ; with coils, the primaries of

Text Appearing After Image:

Fig. 41. which are suitably wound, the full spark length as abovemay be obtained. In cases where the electrolytic break is not desired, theonly means to utilize the alternating current is offered bysome form of synchronous interrupter which will effect theabove described modifications of the original current curve ;we will first describe the more usual type which belongs tothe class of platinum interrupters (Fig. 41). An electro-magnet through which the alternating currentis flowing is mounted opposite one pole of a vibrating bar-magnet, causing the latter to be attracted as often as thepolarity of the electro-magnet is opposite to that of the Induction Coils and Interrupters 85 bar-magnet; that is to say, the bar-magnet will swing insynchronism with either the positive or the negative phasesof the alternating current; a tension spring which permitsof adjustment usually keeps the bar away from the electro-magnet. The bar and the upright supporting it carry theplatinum studs, between w

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1901

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