Hasluck, Paul N. (Paul Nooncree), 1854-1931 · London ; New York : Cassell and Co. · leaf 36
DRAUGHTSMEN’S INSTRUMENTS. 35 hickory, or ash, about } in. square. They are bent to the rec wired y , about 7 in. sq y | curve, and kept in position by means of weights. Railway curves (Fig. 48) may be obtained in cardboard, pear- Fig. 48.—Railway Curve. wood, or ebonite, with radii varying from 14… … Fig. 49.—French Curve. arches and the lines of railway sidings. When curves of ever-varying radius are to be inked in, the French curve, shown in Figs. 49 to 51, is used. This consists | Fig. 50.—French Curve. | of a flat piece of hard wood cut out into more or less intricate patterns, with almost…
Mechanical drawing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
