. 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 . h burns do occur, they are deeper andof a very chronic nature, lasting over many months and even years,if, in fact, they ever get well. High vacuum tubes contain a verysmall amount of air, and consequently conduct the cathode rayswith the greatest possible velocity, giving off in turn x-rays ofthe most penetrating character. Tubes of this kind require verystrong coil currents to energize them, and are valuable only forskiagraphic w
. 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 . h burns do occur, they are deeper andof a very chronic nature, lasting over many months and even years,if, in fact, they ever get well. High vacuum tubes contain a verysmall amount of air, and consequently conduct the cathode rayswith the greatest possible velocity, giving off in turn x-rays ofthe most penetrating character. Tubes of this kind require verystrong coil currents to energize them, and are valuable only forskiagraphic work and for the treatment of very deep-seatedgrowths. High vacuum tubes are less likely to burn the tissuesthan the low or medium variety, but it must be remembered thatit is not impossible, even with these tubes, to produce a burn in 100 PRACTICAL ELECTRO-THERAPEUTICS AND X-RAY THERAPY some tissues where the blood supply is poor or the blood im-poverished. Fig. 61 is a diagrammatic representation of a modern heavy coilx-ray tube. This illustration should be carefully studied until thestudent is familiar with all the different parts of the x-ray /^\ a. n ,«2- 2 W Fig. 61.—Diagrammatic view of a heavy x-ray coil tube. 1. Cathode. 2. Target. 3. Disk terminal. Either or both may be connected as the anode. 4. Cathode cap. 5. Target cap. 6. Disk terminal cap. 7. X-ray hemisphere. 8. Glass pocket containing reducing or vacuum regulating agent. 9. Movable swivel. 10. Glass support for cathode. 11. Glass support for target. 12. Target shell. 13. Base metal of target. 14. Platinum face of target. 15. Wire connecting target and disk make both terminals the anode. 16. Pumping tip. 17. Cathode stream, generally invisible. 18. Focus spot. to Tubes are of various sizes and of two general kinds—regulatingand nonregulating—which may be further subdivided into high-frequency, coil, and static tubes. At first the tubes were nearly
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjecteye, bookyear1912
