X rays : an introduction to the study of Röntgen rays / by G.W.C. Kaye.

  • Kaye, G. W. C. (George William Clarkson), 1880-1941.
Date:
1914
Catalogue details

Licence: Public Domain Mark

Credit: X rays : an introduction to the study of Röntgen rays / by G.W.C. Kaye. Source: Wellcome Collection.

    99/280 (page 75)
    To Indi&rubber Bulb By applying a flame to the tube a small quantity of hydrogen diffuses through the hot metal, and the pressure of the bulb can be restored to the right amount. Palladium shows the effect so very markedly that care should be taken in the heating; otherwise the result will be a bulb too soft for use. Indeed, this method should never be employed except when the discharge is running. The Bauer valve (J.Et.S. Jan. 1907) is a more recent contrivance for letting minute quantities of air into Rontgen bulbs. The valve (see Fig. 48) consists of a small unglazed porcelain disc, through the pores of which air can pass. Ordinarily the disc is sealed by mercury, but by means of a pneumatic piston the disc can be laid bare for a moment by pushing the mercury away (page 80). Inferior of Bulb - Porous Plug ->Filfer Porous Plug To harden an X-ray Bulb. rtG. 4s.-The Bauer valve for admitting air into an X-ray If by any mischance a bulb be- bulb. The filter is of gold leaf ^ nil to absorb mercury vapour. comes too soft for use, the only thing possible, apart from drastic re-exhausting, is to try and harden it by prolonged running with as large a coil as can be got. Often it is beneficial to send this hardening dis¬ charge in the reverse direction, i.e. from cathode to anode, temporarily disconnecting the anticathode for the purpose.