Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 345
g. 21)4. The day-light is thus ex-cluded and theshadows of obj<interposed betweenthe fluoroscope andthe tube are plainlyvisible upon theenclosed fluoresc-ing screen. Fig.294 illustrates themanner of viewingthe bones of thehand. The tube isnot generally en-closed, however, asshown in the cut,310.… … Fig. 295.—Transmission of Speech by the Bell Telephone.The transmitter and receiver are exactly alike. THE INDUCTION COIL. 327 wnall spool of fine wire encircles one end of a bar magnetmounted in a rubber tube, the ends of this coil being carriedto the far end of the tube and connected to the…
Electricity · Magnetism
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