File:Radiography, x-ray therapeutics and radium therapy (1915) (14755161514).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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^A/wwwww; ACCUMULATOKS AND DYNAMOS 11 there is no facility for recharging the accumulators, twelve or more largebichromate cells may be used ; but if the apparatus is required for use fre-quently, the recharging of bichromate cells is troublesome. In such circum-stances other methods of obtaming a supply of current must be adopted,such as the use of a small gas engine and dynamo. Free negative terminal. I f i ( I ! ( i i I i I Free positive terminal. Fig. 6.—Accumiilator couuectious. The positive wire going to tlie coil is connected up with thefree positive terminal of tlie accumulators and the negative wire with the free negative terminal. A practical point of some importance in the use of accumulators is tosee that they are kept well charged and ready for use. It is also well toremember the mode of coimection to the coil and break. The drawing aboveillustrates this point. Dynamos A gas or oil engine can be used to drive a small dynamo. The oil motors
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Fig. 7.—Gas Engine and Dyuauio. Generator set with petrol engine. (Siemens.) are similar to those used in automobiles ; they can be easily started, aresmall and portable. 12 KADIOGRAPHY It is hardly necessary to go into details of these outfits as the occasionfor their use is rarely likely to occur except in remote country districts, orfor military purposes. Motor Transformers These transform the alternating current into a continuous one, a motordriven by an alternating current being coupled to a dynamo which deliversa continuous current. The size ought to be chosen so that at least 1000 to2000 watts can be obtained from the dynamo. These motor transformersare very reliable, easy to work, and require scarcely any attention. Themotor transformer should be placed on a solid bed-^late and well awayfrom the X-ray room, as the noise they make is a constant source of annoy-ance to the operator. Having briefly considered the sources of electric current the next stepis to follow the process

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