The practical draughtsman's book of industrial design and machinist's and engineer's companion : forming a complete course of mechanical, engineering and architectural drawing (1866)
Armengaud, M. (Jacques Eugène), 1810-1891, Armengaud, M. (Charles), 1813-1893, Amouroux, M. (Jules), Johnson, William, 1823-1846 · Philadelphia : H.C. Baird · leaf 205
ication. Mr. Miller, of Woolwich, has devised a very useful modifica-tion of 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 as rulers, and the joint… … k 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…
