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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regularly interrupted. One second theammeter will show a considerable amperage, atthe next, practically none. The fluctuation inthe current is also shown by the irregularity ofthe light in the X-ray tube. When this occurs,a new porcelain tube must replace the old, or weare in danger of blowing out our fuse or punc-turing our coil. (See Fig. 10, Wehnelt Inter-rupter.) The Caldwell Interrupter. In its principle,this is much the same as the Wehnelt. It con-sists of a glass jar partly filled with the same so-lution of sulphuric acid and water, the outsidelead rod also descending into the solution. Inthis interrupter the porcelain tube is replaced bya porcelain cup. Inside this cup descendsanother lead rod or coil. One or more minuteholes are drilled in the porcelain cup, which is The Coil and Accessories 33 swung by means of a support to the lips of theglass jar. The wires are connected to the twolead rods. As we have a similarity of metal inthis case, it makes no difference which pole is
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Fig. 10.—Wehnelt Interrupter. P represents the platinum point coming down through the porcelainstem. As the adjusting screw A is regulated, it allows this pointto extend more or less. The more it extends, the more current passesthrough the solution. plus and which minus. When the current isturned on, the same action occurs as in theWehnelt interrupter, in this case the numberof interruptions depending upon the quantity of 34 X-Ray and High-Frequency Currents current and upon the number and size of theholes in the porcelain cup. This interrupter isuseful for treatment work, is cheap and fairlyconstant. The rate of interruption, however,can not be changed except by substituting cups Q + o > U-JJvz ^ j) Fig. 11.—Represents the Caldwell Interrupter. This consists of aninner porcelain jar P having one or more holes through it H.In the outer jar is placed a lead electrode marked —. In the innerjar is placed another electrode marked +. The solution used issulphuric acid and water. W

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