. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . at least twoand a half to three feet in length, and held in position by athumb-screw. The clutch, or clamp, for holding the tubeshould always be of wood, and so constructed that it may bequicklv adjusted and opened wide enough (at least two inches)to receive tubes of any size. A stand should also be providedwith a means for holding the cords connecting the tube withthe machine away from the standard and sides of the tube. Itis also desirable that above the base the upright standard shouldbe of wood
. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . at least twoand a half to three feet in length, and held in position by athumb-screw. The clutch, or clamp, for holding the tubeshould always be of wood, and so constructed that it may bequicklv adjusted and opened wide enough (at least two inches)to receive tubes of any size. A stand should also be providedwith a means for holding the cords connecting the tube withthe machine away from the standard and sides of the tube. Itis also desirable that above the base the upright standard shouldbe of wood. While this is not absolutely necessary, it pre-vents the escape of current from the cords, a matter of im-portance when operating high-vacuum tubes. (See Fig. 13.) 182 STATIC ELECTRICITY. A fluoroscope is an apparatus consisting of a closed cham-ber, provided with an opening surrounded with a fur border toexclude the light when the face is pressed against it i<x thepurpose of observing the opposite side, which is provided with acardboard cover, coated on the inner side with crystals of. l*ig. 15.—Fluoroscopic Screen. platino-barium cyanide or tungstate of calcium, which fluor-esce brightly when exposed to the X-rays. (See Fig. 14.) A pane of lead glass placed on the inside of the fluoroscopeover the screen will protect the eyes from the action of therays. Screens of various sizes are made of the same material asthe fluoroscope, the pasteboard being secured to a frame (seeFig. 15). They are usually employed for examining the chestin a dark room. The convenient size for practical use iseighteen by twenty-two inches. These screens and fluoro-scopes are expensive on account of the material and processof manufacture, costing about 25 cents per square inch. CHAPTEK IV. THE METHOD OF MAKING THE SKIAGRAPHAND DEPENDENT FEATURES. The process of making the skiagraph is simple, but requiresexperience to perfect the details of exposure and skill in theprocess of developing the sensit
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