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 200
very small circles, of half or three quarters of an inch in radius atthe most. In the example we have selected for illustration, thecentre leg is of brass, or German silver, and is in one piece withthe milled handle. It is also providedwith a needle point. The pen is madewith a spring-tempered…
