. Radiography and radio-therapeutics . Lead GlassWindow Clock. i^h Side elevation, show-ing detail. Fig. 402.—Protective screen and arrangement of control apparatus. available. A large coil outfit or a high-tensiontransformer is therefore desirable, and in a largedepartment both may be installed. A number of X-ray tubes must be or more Coolidge tube outfits are necessary. A well-protected tube-stand is another must be provided with convenient mechanicaldevices to facilitate rapid adjustment of thetube to the part of the patient requiring treat-ment (see Fig. 336, p.

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. Radiography and radio-therapeutics . Lead GlassWindow Clock. i^h Side elevation, show-ing detail. Fig. 402.—Protective screen and arrangement of control apparatus. available. A large coil outfit or a high-tensiontransformer is therefore desirable, and in a largedepartment both may be installed. A number of X-ray tubes must be or more Coolidge tube outfits are necessary. A well-protected tube-stand is another must be provided with convenient mechanicaldevices to facilitate rapid adjustment of thetube to the part of the patient requiring treat-ment (see Fig. 336, p. 418). Filters of aluminiumfrom \ to 4 or 6 mm. thick should also be pro-vided. Secondary filters of leather, loofah sponge,chamois leather, etc., must also be at hand. In therapeutic work of this kind, necessitating the employment ofhighly penetrative radiations, the protection of the operators is a matter ofsupreme importance. This may be assured by employing the cubicle system,where the patient and the X-ray tube are enclosed in a room, the outerwall of

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