. Practical electro-therapeutics and X-ray therapy : with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray . Fig. 64.—Modern self-regulating x-ray tube. For use with high-frequency transformer like the portable x-ray coil. tubes are heavier and stronger than the static tubes, and will standmany times the amount of current without overheating or punc-turing. Fig. 65 represents an excellent type of coil tube. It will benoticed that the target (anode) is very strongly and heavily is said by the makers that this target is a heavy pie
. Practical electro-therapeutics and X-ray therapy : with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray . Fig. 64.—Modern self-regulating x-ray tube. For use with high-frequency transformer like the portable x-ray coil. tubes are heavier and stronger than the static tubes, and will standmany times the amount of current without overheating or punc-turing. Fig. 65 represents an excellent type of coil tube. It will benoticed that the target (anode) is very strongly and heavily is said by the makers that this target is a heavy piece of copper,faced with a metallic alloy that will stand double the heat of plat-inum. This is again surfaced with a thin (.001-inch) plate of plat-inum-vidium. With strong currents the author has been able to. Fig. 65.—X-ray coil tube. melt the face of this disk or target, but nothing is gained andeverything is lost by using currents of this strength. When theface of the target is melted, it becomes roughened, and the efficiencyof the tube is destroyed for skiagraphic work. When the target isheated to the melting point, it gives off a considerable amount ofgas, and the tube is lowered to such an extent that the rays lose X-RAY APPARATUS 103 their power of penetration, making it necessary to allow the tubeto rest until cool, when it will have regained its vacuum. Whenproperly handled, these tubes will last for a long time, even for theheaviest skiagraphic work. As the tube gets older, the vacuum willgrow higher and higher, and after a time it will be necessary to re-duce its vacuum a little every time it is used. This process re-quires great care to keep from overheating and puncturing theauxiliary tube. There is very little danger of getting the vacuumtoo low in these extremely high tubes
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjecteye, bookyear1912
