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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e for radiographic work. If wewish our apparatus very complete, we mayhave a mechanical interrupter, and by a furtherarrangement of switches, a Wehnelt inter-rupter, in addition, for our photographic work.(See Fig. 17 showing how this is accomplished.)The wire is carried, then, through the inter-rupters, in the case of the Caldwell it being amatter of indifference which wire is attached tothe outside and which to the inside lead rod.Where the Wehnelt interrupter is used, the posi-tive pole is always attached to the inner leadrod, ending in the platinum tip. We now carrythe wire to the primary of the Rhumkorff coil,through the primary and back to the other streetwire. When our button or switch that connects withthe street current is thrown over, the current 44 X-Ray and High-Frequency Currents passes to the rheostat, the quantity of currentbeing controlled by the lever; through the amme-ter, which registers the quantity of current weare using; through the interrupters, which splitn P j
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Fig. 17.—Represents the way of connecting all three interrupters sothat either one can be used as desired. A represents the ammeteror the rheostat, W the selecting switch, S the main line switchfor turning the current on and off. up our current, changing it from a continuousunidirectional current to a rapidly interruptedcurrent (the number of interruptions depend-ing upon the holes in the porcelain jars in the /*- The Coil and Accessories 45 Caldwell interrupter, the quantity of platinumexposed in the Wehnelt interrupter, the rapid-ity of revolution of the dasher in the mercury-jetinterrupter or the number of vibrations in themechanical interrupter), into and through theprimary and back to the street current. The passage of the current through the pri-mary induces a current in the opposite directionin the secondary at the make, at the break thesecondary current is again reversed. This iscalled the secondary current. As has already been described, the oppositeends of the wire in the

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