Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 354
dle (F, Fig. 215,c),the other being connected with an insulated ferrule (G) upon thespindle. A spring (H) in connection with this latter ferrulealso presses against the spindle, and while it presses short-circuits the current. By filing away the opposite faces of thespindle to the form shown at K,…
Electricity
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