Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 38
s, this instrument can be adjusted tovarying radii, but if the strip be bent beyond a moderate extentthe curve loses its circular character and becomes approximatelyparabolic. For inking-in large curves, such as those of elliptical arches,splines are very useful. These may be made of lancewood,… … Fig. 48.—Eailway Curve. wood, or ebonite, with radii varying from 1^ in. to 240 in., eachcurve being numbered according to its radius in inches. Theseare also useful for setting out flat curves, such as those of camber
Mechanical drawing
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