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a turbine-shaped wheel as a centrifugal pump, the process being inverted so that, in place of obtaining power by means of descending water, we may raise water by applying a given power. The centrifugal pump known as the Gwynne pump was used by Andrews and Brother in New York in 1844. Centrifugal pumps. In Fig. 1216 are shown several forms of the centrifugal pump, differing more in detail and proportion than in principle. A shows Gwynne's centrifugal pump, which has six equidistant pwo in number in each drum. As in the other pumps, the form of the helices is professedly such as to make the section of passage inversely proportional to the velocity of the water at different distances from the center. Centrifugal pump. Andrews's centrifugal pump (D, Fig. 1216) resembles a helix or snail's shell, which forms the base of a double cone placed with its axis in a horizontal position, the space between the inner and outer cones being the chamber of the pump, and occupied by
ing fillings. Per-mu-ta′tion-lock. (Locksmithing.) A lock which the moving parts are capable of transposition, so that, being arranged in any concerted order, it becomes necessary before shooting the bolt to arrange the tumblers. The letter-lock (which see) appears to have been the earliest of this class; and locks on the same principle, but of more complicated mechanism, still form a favorite subject of invention. The permutation principle was introduced into tumbler-locks by Dr. Andrews of New Jersey, about 1841. The tumblers are capable of variable adjustment, and the key has a series of small shiftable steel rings of such radii as to suit the variable tumblers. To this succeeded the Hobbs lock, invented by Newell of New York, which is provided with a series of secondary tumblers separated from the main tumblers by a wall; the secondary tumblers have notches corresponding to teeth on a series of intermediate tumblers, which teeth correspond to the hights of the main
n chamber, the water being driven around its margin by the centrifugal power of the wheel. For early inventions in this line, see,-- Le Demour1732 Inverted Barker's mill Jorge-West.1816 Massachusetts centrifugal1818 and 1830 Blake1831 Andrews1839 Whitelaw1841 and 1846 Gynne1844 Bessemer1846 and 1851 Andrew1846 and 1850 Van Schmidt1846 Appold1848 See also centrifugal pump. Fig. 4467 is a (so-called) rotary pump. All that is rotary about it is the wheel, on which are the 72,729.Fink31, 12, 1867 72,831.Ferry31, 12, 1867 66,312.Donehoo2, 7, 1867 59,965.Chapman27, 11, 1866 59,819.Clark20, 11, 1866 73,875.Clark28, 1, 1868 61,522.Donehoo29, 1, 1867 52,139.Christ and Stehman23, 1, 1866 Running-Rein. 67,837.Andrews (over-head)20, 8, 1867 69,893.Beans15, 10, 1867 66,941.Brown23, 7, 1867 80,897.Barnes11, 8, 1868 Running-Reins to pull on the Bit to check Horses, mostly in connection with Gag and Check Hook. 74,623.Smokey18, 2, 1868 Seitz26, 9, 1
nterApr. 13, 1869. 89,040GuinnessApr. 20, 1869. 89,064MuirApr. 20, 1869. 89,489LyonApr. 27, 1869. 89,987GriswoldMay 11, 1869. 90,552JonesMay 25, 1869. 93,511AndrewsAug. 10, 1869. 93,921Stoops et al.Aug. 17, 1869. 93,881HeckendornAug. 17, 1869. 93,962ButterworthAug. 24, 1869. 94,112HoffmanAug. 24, 1869. 94,467BradishSept.v. 8, 1864. 45,059MackNov. 15, 1864. 45,528SmithDec. 20, 1864. 49,023ZuckermanJuly 25, 1865. 52,847HarlowFeb. 27, 1866. 56,805SchwalbachJuly 31, 1866. 58,366AndrewsOct. 2, 1866. 60,433SingerDec. 11, 1866. 61,270SingerJan. 15, 1867. 76,807PepperApr. 14, 1868. 76,950SherwoodApr. 21, 1868. 77,715ChabotMay 12, 1868. 80,907Bng Surface above Cloth. (continued). No.Name.Date. 12,577RobertsonMar. 20, 1855. (Reissue.)343RobertsonJan. 15, 1856. 16,850RobertsonMar. 17, 1857. 18,566AndrewsNov. 3, 1857. 19,171BoydJan. 19, 1858. 22,225BerryDec. 7, 1858. 22,269TylerDec. 7, 1858. (Reissue.)1,073TylerNov. 13, 1861. 48,007WittnebenMay 30, 1865.