. Electricity in diseases of the eye, ear, nose and throat . rrent could besent throngli a gas by a moderate electric intensity,but, with a high intensity, a considerable currentw^ould pass. A vacuum can be produced, throughwhich no current can be made to pass. A stream ofparticles, (Guilleminot thinks probably hydrogen),flows from all parts of the anode end of the tube to-ward the cathode, receives a negative charge, is thenrepelled with tremendous velocity and focussed uponthe anti-cathode target, where the cathode rays arestopped and absorbed and Roentgen rays areemitted and ejected through
. Electricity in diseases of the eye, ear, nose and throat . rrent could besent throngli a gas by a moderate electric intensity,but, with a high intensity, a considerable currentw^ould pass. A vacuum can be produced, throughwhich no current can be made to pass. A stream ofparticles, (Guilleminot thinks probably hydrogen),flows from all parts of the anode end of the tube to-ward the cathode, receives a negative charge, is thenrepelled with tremendous velocity and focussed uponthe anti-cathode target, where the cathode rays arestopped and absorbed and Roentgen rays areemitted and ejected through the wall of the tube infront of the target. Roentgen found :r-rays atfect a photographicplate in the same manner as light. J. J. Thompson showed that they produce con-ductivity in any gas through which they pass- Therays are very similar to light rays, but they are notrefracted when they pass from one medium toanother of different density. They also resemblecathode rays, but they differ from them in carrying-no electric charge. Macalaster Wiggin Fig. 31.—Tungsten Target Tube. GALVAISrO-FAEADIC WALL PLATE. 49 CHAPTER II. ELECTRO-THERAPEUTIC APPARATUS. In the present chapter, the intention is to callattention to the prevailing types of electro-thera-peutic apparatus in general use rather than to ad-vertise the product of any particular manufacturer,for, while the mechanical details may vary widelyaccording to the individual ideas of different makers,the purposes for which such apparatus is in-tended are alike with all, and the high standard ofworkmanship generally prevailing is such that com-parisons are unnecessary. Apparatus suitable forthe uses of the physician is to be had of any of the reg-ular instrument supply houses, and the pages of theprominent journals contain many advertisements ofother makers who are producing special apparatusof recognized worth. If, in the selection of illustrative cuts, undueprominence seems to have been given the apparatusof certain
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