St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 96
this kind. 117. Magneto Testing Bells,Fig. 122, are really small hand-power djmamos. The armature ismade to revolve between the polesof strong permanent magnets, andit is so wound that it gives a cur-rent with a large E. M. F., so thatit can ring through the large re-sistance of a long line to test… … Fig. 120. 94 THE ELECTRIC BELL AND SOME OF ITS USES. bell is fastened to the lid, and receives current from adistant bell. Il8. Electric Buzzers have the same general con-strudtion as eledlric bells; in fadt, you will have a buzzer
Electricity
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
