Addyman, Frank Thornton · London : Scott, Greenwood & co. · leaf 35
begins to draw -Awa,yfrom the cathode, leaving a dark space inside it. Fig. 2 showsthe most convenient form of vessel for exhibiting this pheno-menon. The main tube lies between the two platinum ter-minals marked respectively + and - , and it is within this tubethat the light and dark spaces are to… … Fig. 2.—Discharge through Partial Vacuum. sheath, at the zone indicated by the arrow head, is the darkspace. As the pressure is further diminished, the dark spacebecomes wider, and soon afterwards the blue light dies away;and instead of the air within the tube giving light, the glassitself begins…
X-rays
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