Electric toy making for amateurs. This work treats on the making of electrical toys, electrical apparatus, motors, dynamos and instruments in general ... By T. O'Conor Sloane .. (1914)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, The N.W. Henley publishing co. · leaf 182
ed while coarserwire will permit indication of larger currents. A Cheap Polarity Indicator. It is often desirable to test the polarity of theelectric current, especially if the leads are somedistance from the battery or generator, and it isimportant to know the polarity as in the case ofcharging a… … Fig. 74. DepictingIEasily Made Galvanometer and Useful. Polarity Detector. or in wiring, a polarity indicator will save con-siderable time. A cheap indicator for this purposemay be made as shown at Fig. 74 D. It consistsof a small wide mouth vial or bottle, such as vase-line comes in, for instance,…
Electric apparatus and appliances · Electric toys
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