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The practical draughtsman's book of industrial design, and machinist's and engineer's drawing companion: forming a complete course of mechanical, engineering, and architectural drawing. (1857)

Armengaud, aîné (Jacques-Eugène), 1810-1891, Armengaud, Charles A., 1813-1893, Amouroux, Jules, Johnson, William, 1823-1864 · New York : Stringer & Townsend · leaf 176

An illustration from The practical draughtsman's book of industrial design, and machinist's and engineer's drawing companion: forming a complete course of mechanical, engineering, and architectural drawing., 1857, leaf 176
ed BOOK OF INDUSTRIAL DESIGN. into a series of infinitely short lengths, he proposed to take a moreobtuse cone for each larger portion, and in such progression, thatit would require equal pressure for every portion of the surface tocause a uniform sinking of the plug in the course of wear.… … hence the use of the simple instrument illustrated by fig. 2. Thiscontrivance consists merely of a straight brass wire, a, jointed atone end by a pin to the upper surface of a small wooden slider, b,which is hollowed in the centre to receive the tip of the finger indrawing a curve. A small…

Mechanical drawing

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