. The Röntgen rays in medical work . he vacuum in the tube may easily be reducedtoo much ; and when old, the emission of gas from the side-tubewhen excited may become deficient. A most ingenious method of reducing the vacuum is based uponthe power possessed by platinum of becoming permeable to hydrogenwhen heated. A thin-walled tubular wire uf platinum, closed at itsouter end, is sealed into a side-branch of the x-ray tube. Itprojects outwardly for a distance of about 2 inches. If theoutwardly projecting part is heated to redness in a spirit-lampflame, hydrogen from the flame is absorbed by th
. The Röntgen rays in medical work . he vacuum in the tube may easily be reducedtoo much ; and when old, the emission of gas from the side-tubewhen excited may become deficient. A most ingenious method of reducing the vacuum is based uponthe power possessed by platinum of becoming permeable to hydrogenwhen heated. A thin-walled tubular wire uf platinum, closed at itsouter end, is sealed into a side-branch of the x-ray tube. Itprojects outwardly for a distance of about 2 inches. If theoutwardly projecting part is heated to redness in a spirit-lampflame, hydrogen from the flame is absorbed by the metal, and passes 16 THE RONTGEN RA YS IN MEDICAL WORK through it into the tube. This contrivance is known in France asthe osmo-regulator of Villard. It is shown in Figs. 5, 6, and platinum tube is delicate, and should be protected by a glasscap, as shown in Figs. 6 and 7. With this device the resistance ofa tube can be lowered as often as may be desired. With the othercontrivances previously described this is not the case.*. Fig. 6.—Gundelachs Tube for Heavy Discharges (Schall).
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