File:American practice of surgery - a complete system of the science and art of surgery (1906) (14759534846).jpg

Identifier: americanpractice01brya (find matches)
Title: American practice of surgery : a complete system of the science and art of surgery
Year: 1906 (1900s)
Authors: Bryant, Joseph D. (Joseph Decatur), 1845-1914 Buck, Albert H. (Albert Henry), 1842-1922
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Publisher: New York : W. Wood and company
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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nition will also be very poor. It is vvry important to note here thatthe milliammeter, wi.en the tube is in this condition, will read zero; yet we may have exactly the samecondition in the primary circuit as exists when the tube presents an appearance such as is illustrateil inFig. 3 of the present plate. Ihe inverse discharge is so great that direct a:-ray reading is completelywiped out. This inverse discharge may be overcome to (juite an extent by using a series spark gaj)or ventral valve tube, by lowering the vacuum by means of the regulator and then raising .self-inilu(-tion of the primary. It is advisable not to operate the tube when it presents this condition, as thetube then becomes blackened and overheated. Overcome the tendency of the coil to produce this con-dition by the means suggested, viz., by tlie series spark gap or \-entral valve tube. Some coils willoperate much better if the spark gap is kept constantly in series with the tube. Amkrigan Practice of Surgery. Plate V.
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Stages in Ripening or Seasoning x-Ray Tubes THE TECHNIQUE OF RADIOGRAPHIC WORK. 609 and the discharge will jump across an air gixyy of 5 to 7 inches as estimated bymeans of parallel spark rods, with which nearly all coils are equipped. Undersuch conditions the tube should be lowered by means of the regulator, that is,by allowing the discharge to pass through the chemical or by heating the pala-dium regulator if of the osmosis variety. This allows gas to pass into the tube,and in this manner lowers the resistance. If the current is now turned on in suf-ficient quantity the tube will glow with an api)le-green fluorescence. Bright fiu-orescent spots oftentimes appear on different parts of the tube; this appearancemay last for seATral minutes if only a small amount of energy is allowed to passthrough the coil. If, however, heavy discharges are sent through the coil, thiscondition soon changes in a new unseasoned tube with the Wehnelt interrupter,and a warning note is invariably heard just

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