International Library of Technology · Scranton, International Textbook Co. · leaf 380
sed. Of course, with alternating current it makesno difference how the lamp is connected in circuit, as thecurrent is continually reversing anyway and both carbonsburn alike. It is an easy matter to tell when a direct-cur-rent lamp is correctly connected. Allow the lamp to burnfor a short time,… … Fig. 7. 15. For use in stereopticons and other projection appa-ratus, the carbons are often inclined at an angle, as shown in Fig. 7. The objectin doing this is to allowmore of the light fromthe crater to reach thelenses. I.n searchlightsa similar arrarigementis used, only the car-bons are often…
Electrical engineering
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