The electro-therapeutic guide, or, A thousand questions asked and answered . ht angles tothe outer surface of the tube. The divergence of the X-rays equal, in all conditions, in every sixteeninches, 13-16 of an inch. The distortions of fluoroscopic views may bemathematically corrected. The rays travel in straight lines to infinity, and cannot be deflected,reflected, or refracted, or stopped by ordinary opaque substances. The partof the greatest concentration of the X-rays, or the field of strongestactivity, is opposite the focal point, and in a line at right angles to the sur-face of t
The electro-therapeutic guide, or, A thousand questions asked and answered . ht angles tothe outer surface of the tube. The divergence of the X-rays equal, in all conditions, in every sixteeninches, 13-16 of an inch. The distortions of fluoroscopic views may bemathematically corrected. The rays travel in straight lines to infinity, and cannot be deflected,reflected, or refracted, or stopped by ordinary opaque substances. The partof the greatest concentration of the X-rays, or the field of strongestactivity, is opposite the focal point, and in a line at right angles to the sur-face of the target which is usually the anode. When is a tttbe said to back op a spark^? When the discharge refuses to pass through a tube it is said toback up a spark, which may be two, four, or more inches between theterminals. This is the condition in which we experience a great waste ofcurrent and the possibility of electric burns. When the resistance in thetube is high, and the X-rays intermittent, the liability to these injuries isapparent. What are X-ray or Crookes tttbes ?. 120 X-ray tubes are vacuum tubes of various shapes for use in radiographyand radio-therapy. They are made in many shapes, some of which areillustrated herewith. Nos. 120 and 130 are to be used in cavities. 152 THE ElvHCTHO-THERAPEUTlC GUIDE TUBE POINTERSWhat points showld be remembefed about X-tay tubes ? Do not short circuit the tube and run continuously, as too much gaswill then be driven off, A very few sparks, sometimes one or two, shouldlower the vacuum sufficiently for the time being. When the tube cools off after use the vacuum will probably go upagain, and may be brought down as in the first instance. A long run mayalso raise it somewhat. The best X-ray results depend upon a nice adjustment of the vacuum,for which some tubes are especially designed. If by chance the vacuumshould be lowered too much by using the regulator, prolonged running, or arest, will raise it again. We believe that experienced ma
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