. Radiography and radio-therapeutics . asy. Several types of screening stands areillustrated. The most useful are Wenckebach, the extremely ingeniousbut complicated one shown in Fig. 105, and the apparatus of Butt withautomatic stereoscopic movements (see Fig. 99, p. 106). Care should betaken to ensure the complete protection of the operator. The fluorescentscreen should have protected handles, and the front must be protected bythick lead glass. This .should be tested to make sure that it is efiicient. The Screening Stand may be constructed in such a manner that it can 106 RADIOGRAPHY be used
. Radiography and radio-therapeutics . asy. Several types of screening stands areillustrated. The most useful are Wenckebach, the extremely ingeniousbut complicated one shown in Fig. 105, and the apparatus of Butt withautomatic stereoscopic movements (see Fig. 99, p. 106). Care should betaken to ensure the complete protection of the operator. The fluorescentscreen should have protected handles, and the front must be protected bythick lead glass. This .should be tested to make sure that it is efiicient. The Screening Stand may be constructed in such a manner that it can 106 RADIOGRAPHY be used for other purposes in addition to screening, and so it forms a verycomplete type of apparatus, particularly in small hospitals where the spacedevoted to the X-ray department is very limited. The apparatus consistsessentially of a large, totally enclosed protective lined tube-box, with lead-glass observation window fitted with sliding shutter on one side ; at theback is a door and on the front are fitted the diaphragm, compressor tube,. Fui. 99.—Screeiiiijg sUuul iov .stereoscopic work in tlie upright position. (Butt.) The apparatus is arranged so that tube- and plate-hohler move automatically at the rightmoment. The whole mechanism is controlled from the switch table. and other pieces of apparatus. This tube-box is mounted on a carrjangframe, which is fitted with slots, so that it can be brought nearer or takenfurther from the patient, also the whole box can be entirely rotated. Theframe carrying the tube-box is attached to a strong square framework,running up and down between the upright sides of the stand. This frameis fitted with counterweights, so as to move freely up and down, and on thefront of it are two rods projecting forward, and sliding on these rods is ametal carrier and carriage for holding the fluorescent screen or plate-holder, SCREENING STAND 107
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