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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
Draw′ing. （Drafting.) An instrument for drawing scrolls or spirals, either on paper, in the ordinary course of mechanical or architectural drawing, or to lay out scrolls for hand-rails of winding stairs, etc. Instruments for drawing Spirals and Scrolls. No. 97,571.TruesdellDec. 7, 1869. No. 99,853.CrandellFeb. 15, 1870. No. 138,053.StebbinsApril 22, 1873. Instruments for laying out Stair Curves. No. 5,380.WoosterDec. 4, 1847. No. 18,110.StewartSept. 1, 1857. No. 24,763.ShaefferJuly 12, 1859. No. 66,796.ClowJuly 16, 1867. No. 75,423.HooverMar. 10, 1868. No. 97,707.SchollarDec. 7, 1869. Spi′ral pump. A form of the Archimedean screw water-elevator, consisting of a pipe coiled spirally round an inclined axis. It is said to have been invented about 1750 by Andrew Wirz, a pewterer of Zurich, and was employed in Florence with some improvements by Bernoulli, in 1779. See screw. Spi′ral-rib bit. A wood-boring tool adapted to be used in a brace. It has