Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 345
. 294. The day-light is thus ex-cluded and theshadows of objectsinterposed 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.… … 295.—Transmission of Speech by theBell Telephone.The transmitter and receiver are exactly alike. THE INDUCTION COIL. 327 small 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 binding…
Electricity · Magnetism
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