File:Roentgen induction coils for quick work (1903) (14777939733).jpg

Identifier: roentgeninductio00jame (find matches)
Title: Roentgen induction coils for quick work
Year: 1903 (1900s)
Authors: James G. Biddle Company
Subjects: X-rays Induction coils Radiography
Publisher: Philadelphia : James G. Biddle
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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he anodes are adjusted to carry different amounts of current thecharacter of the discharge from the coil can be changed readily fromlight to heavy and vice versa by simply changing the position of theswitch. This modification is, in every other respect, like the usualform which is made with but one anode. It is provided with handles mounted on its wood case, makingit easily portable. The water cooling worm of lead tubing is just thesame as in the other form. The special hard porcelain construction of the anode is the same.The only difference in fact is the use of the three anodes, making itpossible to set them for light, medium and heavy discharges of thecoil respectively. After the anodes have once been adjusted, the dif-ferent kinds of discharge can be obtained by the manipulation of theswitches and the rheostat, the interrupter itself requiring no atten-tion. It may be placed in another room if desired. JAMES G. BIDDLE. II14 CHESTNUT STREET, PHILADELPHIA. Roentgen Series Spark Gap,
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Fig. 5. The well known phenomenon of the inverse discharge of theinduction coil makes it advisable to use some form of resistance inseries with the terminal of the induction coil and the X-Ray tube toprevent this inverse discharge from going through the tube. Whenthis inverse discharge is permitted to pass through the tube a black-ening of the inner walls of the tube occurs and is attributed to thedeposition of the metal of the electrodes upon the glass. The mostpractical form of resistance has been found to be a spark gap placedin series with the terminal of the induction coil and the tube, as theinverse discharge often is of sufficient voltage to jump across the re-sistance of an inch of air or more. If the series spark gap is greaterthan the distance through which the inverse discharge will jump itcannot pass into the tube and blacken it. The Roentgen series spark gap is readily adjusted to the top ofthe coil terminal by placing it in position, not requiring any bindingposts for mo

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