The mechanical engineer's pocket-book. A reference-book of rules, tables, data, and formulæ, for the use of engineers, mechanics, and students (1910)
Kent, William, 1851-1918 · New York, J. Wiley & sons · leaf 101
Fig. 64. the distances 1, 2, 3, 4, etc .curve is drawn, as shown in Fig. … In the common spiral (Fig. 64) thepitch is uniform; that is, the spiresare equidistant. Such a spiral ismade by rolling up a belt of uniformthickness. To construct a spiral with fourcentres (Fig. 65). — Given thepitch of the spiral, construcfa squareabout the centre, with the sum ofthe four sides…
Mechanical engineering
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