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 201
in either direction, the centre leg may beadjusted with great accuracy at any part of the socket. Inadjusting the instrument to any measurement, the pencil socket,M, is loosened, and set pretty near the mark, and fixed; theexact length of radius is then obtained by adjusting the centre legby means… … 3g is fixed to the bar, and the moveable leg iscarried by a socket entirely embracing the bar,and sliding upon it. An additional socket iscarried by the bar, and is connected to the firstby a longitudinal screw spindle, whilst it maybe fixed at any point on the bar by means ofa pinching screw…
Mechanical drawing
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