Machinery and processes of the industrial arts, and apparatus of the exact sciences (1869)
Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Washington, Govt. print. off. · leaf 641
ed disk G, by means of a pinion. Theentire revolutions of the roller are recorded by this disk ; an index onthe left serving to mark the divisions as they pass. The reading offractional parts of a revolution is made by means of a vernier, shown atL. A horizontal rod B is hinged to the apparatus… … Amslers Planimeter. imeter, is carried along the lines of the figure to be measured. Theinstrument rests, therefore, on the roller D, and the revolution of thisroller is produced by friction upon the paper. The point E being fixed,and all other parts of the instrument free, the movement is…
Machinery · Scientific apparatus and instruments
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