File:Radiography, x-ray therapeutics and radium therapy (1915) (14571247987).jpg

Identifier: radiographyxrayt00knoxuoft (find matches)
Title: Radiography, x-ray therapeutics and radium therapy
Year: 1915 (1910s)
Authors: Knox, Robert, 1868-1928
Subjects: Radiography Radiotherapy X-rays
Publisher: London : A. & C. Black
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: MSN

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Fig. 187.—Bauer qualimeter.(Favre.) Comparative Scale of the usual Instruments for Measuring THE Hardness of Tubes hard soft medium Bauer .... 1 . 2 3 4 5 6 7 8 9 10 Wehnelt . 15 3 4-5 6 7-5 9 105 12 13-5 15 Walter .... 1 1-2 2-3 3-4 4-5 5-6 6-7 7-8 Benoist 1 2 13 4 5 6 7 8 9 10 THE THERAPEUTIC COIL 269 It is weU to have all these instruments—valve tubes, niiniamperemeter,qualimeter, and oscilloscope tube—in the circuit, especially when a greatdeal of work has to be done, as they facihtate speed in working, and enablethe operator to see that the conditions under which his work is being carriedout are correct. The Therapeutic Coil should be at least twelve inches spark-gap, andwhere more than one is possible a 16-inch coil should be installed. Anymodern coil is adequate, but the type Hkely to give the best results is one of spark-gap Milliamperemeter CoU enclosed Interrupter Rhythmeur
Text Appearing After Image:
Controlapparatus Fig. 188.—Therapeutic outfit suitable for deep therapy. (Schall.)The interrupter is arranged for the passage of heavy currents. At the top of the motora small fan is arranged to drive a current of air through the primary of the coil for coolingpurposes. A rhythmeur is arranged below the mercury interrupter. the so-called intensive coils ; that is, one giving a high secondary outputwith a moderate primary current. When possible, the coil should be mountedwell away from the control apparatus, and the terminals, high-tension cables,etc., should be separated as widely as possible to prevent a leak to earth orsparking between the terminals. With the larger coil it should be possibleto pass heavy discharges through the hardest X-ray tube. The CooHdgetube requires, when very hard rays are used, a heavy discharge from thesecondary. This may be obtained from the larger coils now in use. Whenthese very hard tubes are used the high tension transformer, such as the 270 RADIATIO

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