The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 174
investigations. From the period of Franklins discov-eries what is said of the rank of electricity among the sciences ? What is saidof the Plate Electric Machine ? 168 PLATE MACHINE. dered firmly to the shaft, Avhile the other is movable, and screws up against the glass plate. Two morocco… … buff leather, coated w^ith amalgam, are fastened to brass plates,w^hich are pressed against the glass plate on either side bybrass springs, S. These springs are set in a hub placed on thetop of the negative post, and held firmly by the negative ball,N, which screws down against it. The prime…
Physics
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