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 205
ating by scale and multiplication. Mr. Milier, of Woolwich, has devised a very useful modificationof the common jointed rule. This instrument is termed a radiator, and our engraving, fig. 36, represents a portion ofit in plan, whilst fig. 37 is an end elevation. The inner edges ofthe legs are used… … < witii sockets, which admit of any length of ruler being used.The radiator is applicable to the following purposes :— For drawing lines in perspective, or geometrical drawing, to apoint or centre; for setting off angles as a protractor ; for a right-angled triangle, or any oth^r angles ; and…
Mechanical drawing
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