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 280
What does Fig. 219 show? 274 RECIPROCATING ARMATURE ENGINE. carrying with it the disc so rapidly as to cause the seven colorsto appear blended in one, viz., a brownish white. 247. The Reciprocating Armature Engine^ Fig. 220, is an … interesting contrivance for showing the reciprocating and rotarymotion which may be imparted by the electro-magnetic influ-ence. Two electro-magnets, M M, are firmly secured in a ver-tical position, having their four poles appearing just above thesmall wooden table. Two armatures, A A, connected by…
Physics
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