Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 381
nd the legs of a dividers, set onthe foci of the ellipse. 1531/. SPIROGRAPH.—An instrument -for drawing spiralcurves. A pair of compasses with a lengthening leg to allow of a vertical position of the stationary leg c, bis a sleeve and knurled button loose on thevertical leg by which the pencil or… … Section XVIII. MISCELLANEOUS DEVICES. Animal Power, Sheep Shears, Movements and Devices, Elevators,Cranes, Sewing, Type-Writing, and Printing Machines, Rail-way Devices, Trucks, Brakes, Turntables, Locomo-tives, Gas, Gas Furnaces, Acetylene Gen-erators, Gasoline Mantle Lamp,Firearms, Etc.
Mechanical movements
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