A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 459
the keeppr, and having its two ends ter-minating, the one in a copper disk on the spindle exterior to thekeeper, and the other in a small cross-head upon the same axis.The disk revolves, having a small part of its lower rim immersedin mercury. The cross-head alternately dips its two ends into… … M is the horseshoe magnet, composed of three flat magnetsunited, and is about 9 or 10 inches long; a is the axis on whichrevolves the keeper K, to which it is connected through the inter-vention cf the brass disk d, and at the other end the pinion h setin motion by the tooth wheel and winch H.…
Physics
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