File:The American journal of roentgenology, radium therapy and nuclear medicine (1906) (14570821840).jpg

Identifier: americanjournroen08ameruoft (find matches)
Title: The American journal of roentgenology, radium therapy and nuclear medicine
Year: 1906 (1900s)
Authors: American Radium Society American Roentgen Ray Society
Subjects: Radiotherapy X-rays
Publisher: Springfield, Ill. C.C. Thomas
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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ofit-ing by his large experience, the laboratorywill not delay in giving proof of its utility. To describe it briefly, it is housed in abuilding having a basement and two stories. Editorials 39 In the basement are a preliminary vacuumapparatus (a motor and a pump working inoil), and a converter for changing no V.D.C. into 250 V. single phase alternatingcurrent of 600 periods (60 cycle.^). Thisgroup has a capacity of 5 K.\\ A.C. Theground floor includes an office, a dark room,and two laboratories. The smaller labora-tory is at present reserved for the study ofLilienfeld apparatus. The larger one con- cludes a Bragg spectrometer and a Brogliespectrograph. These permit the simultaneousanalysis of rays from two sources enclosedin lead boxes of about one cubic centimetercapacity, and having a wall thickness of 15mm. Two other pieces of spectroscopic ap-paratus, including a monochromateur, and aspectrograph of special precision for thestudy of very short wave lengths, are underconstruction.
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Fig. 4. Another Part of Research Room, showing the quartz vacuum pump andGaede pump on the right, the large lead box (weighing over a ton) in thecenter, and the spectrometers on the left. tains (a) a coil with mercury interrupterworking on the no V. D.C, and (b) a Gal-lot-Gaiffe transformer working on the 120V. single phase alternating current, andwhich can supplv the incandescent cathodetype tubes with a maximum of 170 K.V.controlled by an auto-transformer. Voltagesare measured by an Abraham-Villard elec-tro-static voltmeter. This laboratory h?s alsofacilities for pumping vacuum tu):!es, namely,a special quartz condensation pump, with aGaede rotarv pump for preliminary pump-ing, permitting the obtaining of very highvacuums with considerable speed; and aPilon apparatus. The spectroscopic apparatus in use in- The experimental tubes used are almostexclusively constructed of cjuartz. The researches undertaken by the labora-tory are not confined to purely theoreticalphvsics. An important

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