Five hundred and seven mechanical movements (1903)
Brown, Henry T. [from old catalog] · New York, Brown & Seward · leaf 85
Mechanical Movements. 8i 322. A very convenient construction ofparallel ruler for drawing, made by cuttinga quadrangle through the diagonal, formingtwo right-angled triangles, A and B. It isused by sliding the hypothenuse of one tri-angle upon that of the other. 323. Parallel ruler consisting of a…
Mechanical movements
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