International Library of Technology · Scranton, International Textbook Co. · leaf 207
bubblesuntil the air is completelyexhausted. When the airhas become exhausted, themercury falls from the topto the bottom of the tubewith a sharp click. Thisstyle of pump is capableof producing a high de-gree of exhaustion, but,unfortunately, it is ratherslow in its action. Thepump has been… … fig. 6. 10 ELECTRIC LIGHTING. § 16 process of exhaustion much more rapid. In this process,the air is first exhausted to quite a high degree by mechan-ical pumps. A gas is then introduced, which combines withthe remaining gases and renders them incapable of actingon the filament. The process is in…
Electrical engineering
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