Colwell, Hector Alfred, Russ, Sidney · London, G. Bell and sons · leaf 27
yCoolidge in producing an X-ray bulb, the radiation fromwhich is capable of accurateadjustment by the operator.The principle underlying theworking of the bulb differs Fio. 4.—Coolidge X-Ray Tube. The cathode stream Om that of the Ordinary cu,^im1ro.nThebktfer;A.^^ ° ^^ ^ focus tube lu au important… … THE RONTGEN OR X RAYS ii fact that when certain metals are heated to a very high tempera-ture they emit electrons ; and these electrons form the cathodestream in the Coolidge tube. The cathode C (Fig. 4) consistsof a small flat spiral of tungsten which is heated by a currentof 4 or 5 amperes; this…
X-rays -- Physiological effect
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