St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 171
7 shows one form.They contain eledlromagnets so arranged that when the i68 MISCELLANEOUS USES OF ELECTRICITY. armature is attradled by the pushing of a button any-where in the building, the door can be pushed open. 176. Dental Outfits. Fig. 258 shows a motorarranged to run dental apparatus. The…
Electricity
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