A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 459
inciple of the telephone may perhaps be most easily understoodby an examination of Dolbears simple form of the instrument, shown inFig. 339.—N S is a permanent bar magnet, bearing on one end the helix H, 454 APPENDIX. of insulated copper wire. D is the diaphragm—a disk of sheet-iron V so ofan inch…
Physics
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