Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 126
Fig:. 142.an angle. A second plate B is perforated by the same number ofholes so directed as to form a right angle with the direction ofthose in the plate A. The upper plate can turn, and carries anindex to record the number of revolutions, and the whole is thenattached to a bellows.* A series of…
Physics
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