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18, 1870; June 21, 1870; August 20, 1872. In the June 21, 1870, patent, the surface is reduced by devices moving parallel to a vertical plane passing through the axis of the roll, but inclined to a plane passing horizontally through the said axis. This obliquity is obtained by the depression of one of the bearings. The effect is to give a diminished waist to the roller, the grinding line being a curve and the roll spindle-shaped. See also description under roller, 10 (previous page). Elliott, December 15, 1874, has an arrangement of three grinding wheels presented at an angular relation of 120° to the roll to be ground, the grinders being journaled in a frame, which is free to move in all directions in a plane transverse to the cylinder placed between them, their movement depending on the surface to be ground. To prevent undue pressure of the upper wheel upon the surface, the weight of the frame is counter balanced by a lever and counterpoise. Roll′ing. 1. (Metal-worki
3. 144,974GasparyNov. 25, 1873. 148,192Doolittle et al.Mar. 3, 1874. 149,580ElliottApr. 14, 1874. 149,764LilleyApr. 14, 1874. 150,167LilleyApr. 28, 1874. 150,5 24, 1868. 79,571Hewitt et al.July 7, 1868. 81,454AllenAug. 25, 1868. 88,558ElliottApr. 6, 1869. 101,328VeaseyMar. 29, 1870. 101,843ElliottApr. 12, 1870. 101,8ElliottApr. 12, 1870. 101,844ElliottApr. 12, 1870. 101,924RyderApr. 12, 1870. 103,782SargeantMay 31, 1870. 107,666CourtsSept. 27, 1870. 112,740RyderMar. 14, 1871. 113,135Bishop et al.Mar.ElliottApr. 12, 1870. 101,924RyderApr. 12, 1870. 103,782SargeantMay 31, 1870. 107,666CourtsSept. 27, 1870. 112,740RyderMar. 14, 1871. 113,135Bishop et al.Mar. 28, 1871. 115,060JonesMay 23, 1871. 115,779Stafford et al.June 6, 1871. 116,040FontayneJune 20, 1871. 118,117DuncanAug. 15, 1871. 119,606HatchOct. 3, 1871. 12culum. d is a four-valve speculum. e is a glass-mirror speculum. f is Elliott's intra-uterine speculum. g is Kramar's bivalve ear-speculum. h h′, closial graduated tube, its sinking being the measure of the speed of rotation. Elliott's tachometer, July 28, 1874, is for measuring the speed of vessels. It has a
Vel′lum. A fine parchment made of calf-skin. The skins are limed, shaved, washed, stretched, scraped, and rubbed down with pumice-stone. Velo-cim′e-ter. A measurer of speed. An odometer is ordinarily a measurer of distance, but by combining the element of time, it may become a velocimeter. 1. (Nautical.) The name is usually applied to the marine log, or speed-measurer. There are several different types. a. Pito's tube (see Metcalf's patent, No. 92,078, June 29, 1869); Elliott's tachometer, July 28, 1874. See also Fig. 1568, page 661. The principle is similar to the Lind anemometer, Fig. 205, page 99; the latter measures the speed, or force rather, of a current of air. b. The rotary-pump principle. Walker, No. 68,265, of 1867. c. The log. A chip on the end of the log-line or train of wheels to register revolutions and consequent length of line out. Hotchkiss, No. 45,042, November 15, 1864; Lozier, No. 41,932, March 15, 1864; Barnare, No. 93,513, August