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 208
n Eig.172. Work the machine, and theescape of the electricity from this willcause the wheel to revolve rapidly. Ho-w shown by a metallic point placed on the prime conductor ? When willthe illumination at the point be a star ? When a brush of light ? What issaid in regard to the phenomenon… … ELECTRIC SEASON-MACHINE. 203 Fig. 173. The reaction of the current thus formed may be well illus-trated by the following: Experiment a. — Stand the pointed wire, Fig.173, with its wheel of Ss, on the prime conductor,and excite the machine. The escape of electricitywill produce a reacting current,…
Physics
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