. Radiography and radio-therapeutics . d down; (b) round the column;(c) round the arm; (d) through anangle of 90° round any axis vertical tothe arm, so that this pillar stand permits of adjusting the position of thetube within the widest limits. The tube-box itself is lined inside with lead rubber material, as a pro-tection against accidental effects of the rays. Its back forms a door. Thefront is provided with a rectangular opening of about 170x220 mm., inwhich the accessories subsequently to be described are inserted. In orderto be able conveniently to manipulate the tube-box during adjustme
. Radiography and radio-therapeutics . d down; (b) round the column;(c) round the arm; (d) through anangle of 90° round any axis vertical tothe arm, so that this pillar stand permits of adjusting the position of thetube within the widest limits. The tube-box itself is lined inside with lead rubber material, as a pro-tection against accidental effects of the rays. Its back forms a door. Thefront is provided with a rectangular opening of about 170x220 mm., inwhich the accessories subsequently to be described are inserted. In orderto be able conveniently to manipulate the tube-box during adjustment, itis provided with a handle. One of the sides is fitted with an observationwindow of lead glass, through which the X-rays can only penetrate withdifficulty, and this may be closed by the shutter, when making a fluoro-scopic examination. Two pieces of wood with slots are fitted to the underside of the box, between which the tube-holder, together with the tube,is inserted. The holder must be secured to the cathode neck of the Fig. 86.—Pillar stand, protected tube-boxand accessories. (A. Gaiffe.) THE TUBE-STAND 97 The latter must be so mounted that the anti-cathode is turned towards thefront of the box (with the opening for the X-rays), and occupies about the
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