Addyman, Frank Thornton · London : Scott, Greenwood & co. · leaf 130
a discharge can scarcely be forcedfrom the cathode to a positive terminal placed within the space,whilst the current passes with comparative ease when theanode is removed to a greater distance. This knowledge has been made use of in the constructionof two different tubes, viz., the Penetrator and… … Fig. 36.—Focus Tube: Penetrator Type. The platinum reflector is not the anode, although it can beused as such, the positive terminal of the coil being connectedto a ring-shaped aluminium anode, which is much closer to thecathode than the reflector. This increases the resistance andpenetrating power…
X-rays
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