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
a c Fig. 145. Fig. 146. The theory of this instrument therefore supposes that every planefigure submitted to measurement is made up of infinitely small eircu- THEORY OF THE AMSLER PLANIMETER. 625 W -4 / M.—.J, X lar sectors, or of the differences of such sectors, precisely as Oppi-koffers…
Machinery · Scientific apparatus and instruments
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