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ay 1 inch long, and injecting into the space between them, under pressure, turpentine, bleached oil, or other liquid of high refractive power. When the glass attains the required curvature, close the stop-cock and mount the fluidlens for use. The lens of the new Naval Observatory at Washington has been made by Alvan Clarke & Sons, of Cambridgeport, Mass. It is 26 inches in diameter; the telescope is now in working position in the building erected for it under the superintendence of Professor Newcomb. See the following varieties : — Achromatic lens.Meniscus. Aplanatic lens.Microscopic lens. Bull's-eye.Multiplying-lens. Coddington lens.Object-glass. Concavo-convex lens.Orthoscopic lens. Condensing-lens.Pebble. Convex lens.Periscopic lens. Convexo-concave lens.Photographic lens. Convexo-convex lens.Plano-concave lens. Crossed lens.Plano-convex lens. Cylindrical lens.Polyoptron. Diacaustic lens.Polyscope. Diamond-lens.Polyzonal lens. Double-concave lens.Spectacle-le
eatonApr. 23, 1867. 67,524FroelichAug. 6, 1867. 81,080GoodrichAug. 18, 1868. 87,810WheelockMar. 16, 1869. 93,459MacaulayAug. 10, 1869. 98,409Pratt et al.Dec. 28, 1869. 99,122WarnerJan. 25, 1870. 102,787DulaneyMay 10, 1870. 103,609HawkinsMay 31, 1870. 25. Tension Devices. (continued). No.Name.Date. 103,643MooneyMay 31, 1870. 110,424BennettDec. 27, 1870. 113,027CrumbMar. 28, 1871. 115,756McCarthyJune 6, 1871. 117,644KimballAug. 1, 1871. 119,589EstabrookeOct. 3, 1871. 123,038NewcombJan. 23, 1872. 123,054SpearJan. 23, 1872. 125,535BromleyApr. 9, 1872. 127,982MerrickJune 18, 1872. 129,195WilliamsJuly 16, 1872. 129,761StackpoleJuly 23, 1872. 130,288FairfieldAug. 6, 1872. 136,626TiffanyMar. 11, 1873. 138,381ColesApr. 29, 1873. 148,773StetsonMar. 17, 1874. 149,566BlakeApr. 14, 1874. (Reissue.)5,859EvansMay 5, 1874. 154,084RehfussAug. 11, 1874. 26. Thread-Cutters. 16,713BurnhamMar. 3, 1857. 52,398Dennis et al.Feb. 6, 1866. 67,501SawyerAug. 6, 1867. 90,95