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 (1863)
Armengaud, aîné (Jacques-Eugène), 1810-1891, Armengaud, Charles A., 1813-1893, Amouroux, Jules, Johnson, William, 1823-1864 · Philadelphia : H.C. Baird · leaf 203
n. Mr. Miller, of Woolwich, has devised a very useful modifica-tion of the common jointed rule. This instrument is termed aradiator. and our engraving, lig. :>ti. represents a portion ofit in plan, whilst tig. :!7 is an end elevation. The inner edges ofthe legs are used us rulers, and the joint… … < with 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 aright-angled triangle, or any other angles ; and for…
Mechanical drawing
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