Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 360
ernal resistance isvery small, the best dynamo will be that of least resistance(Art. 163). Moreover, the E.M.F. required in the circuit issmall, but the quantity of electricity very great. In this casewe are forbidden to have our dynamo armatures coiled withgreat lengths of thin wire, as in that… … Fig. 220. low. and the requisite quantity of electricity in the circuitis obtained by very high speed of revolution, which in somemachines varies from 1500 to 2000 revolutions per minute,this speed being attained by a steam- or gas-engine. Among the advantages these lamps offer for domestic…
Electricity
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