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between which the object is held. Simple microscopes, to fold in cases, b c d e, are made with one or several lenses, which have a diameter of from 3/4 inch to 1 3/4 inches. They are variously mounted. The Stanhope lens f was invented by Earl Stanhope, and is a cylinder of glass with two convex ends. It is 1 1/2 inches in length and 1/4 inch in diameter, and is mounted in a metallic tube. The ends have a relative convexity of 6 to 1, and the instrument has considerable power. The Craig microscope comprises a single lens mounted on a stand, a glass for holding objects below it, and a mirror for reflecting light on the under side of the object and lens. The magnifying power is greater than that of the cheapest compound microscopes, and the instrument simple and convenient to use. The compound microscope usually has three lenses, — the object-glass, the field-glass, which intercepts the extreme rays passing through the object-glass and thus enlarges the field of view, and
forward or backward movement of the trigger-guard e places the lock at half-cock, obviating the danger of premature discharge. The Maynard rifle was perhaps the first in which a metallic cartridge was employed. The report of Major Bell to Colonel Craig, Chief of Ordnance, United States Army, May 16, 1856, describes the firing of Dr. E. Maynard's rifle, charged with a metallic cylindrical water-proof cartridge, and dwells upon the important fact of the coincidence of the axes of the ball and, 1871. Scale removed by an acid bath and subsequent heating on racks in an oven to raise the scale in blisters. A thin, tenacious oxide forms on the surface and is preserved. Rolled cold, first singly, then in packs; annealed. No. 103,577, Craig, 31, 5, 1870. Plates are built into packs with intervening charcoal-dust; heated nearly to welding heat; rolled in packs: reviving the metal of the superficial oxide. No. 114,956, Marshall, 16, 5, 1871. Scale removed by saline bath and furna
WilkinsJuly 2, 1872. 137,048BaryMar. 25, 1873. 141,663PeddenAug. 12, 1873. 148,110CookMar. 3, 1874. 2. Cloth and Slide Plates. 44,889PreisNov. 1, 1864. 62,186CraigFeb. 19, 1867. 67,635CraigAug. 13, 1867. 91,484RehfussJune 15, 1869. 131,907SahndersOct. 1, 1872. 133,733WestDec. 10, 1872. 134,209LawlerDec. 24, 1872. 142,40CraigAug. 13, 1867. 91,484RehfussJune 15, 1869. 131,907SahndersOct. 1, 1872. 133,733WestDec. 10, 1872. 134,209LawlerDec. 24, 1872. 142,404LeechSept. 2, 1873. 154,084RehfussAug. 11, 1873. 3. Cutting and Trimming Fabrics on Machine. 18,511MarshOct. 27, 1857. (Reissue.)809MarshSept. 6, 1859. 3. Cutting and Trimming Fabrics on Machine. (continued). No.Name.Date. 42,976WalesMay 31, 1864. 50,451ChilcottOct. 17, 1865. 109,662Ball et al.Nov. 29, 1870. 113,49t. 22, 1874. (Reissue.)6,088SpringerOct. 13, 1874. 156,267BarberOct. 27, 1874. (Reissue.)6,142SpringerNov. 17, 1874. 157,322GrahamDec. 1, 1874. 158,574CraigJan. 12, 1875. 158,813SpringerJan. 19, 1875. 4. Lifting Presser-Foot. 21,671GroverOct. 5, 1858. 24,939KelseyAug. 2, 1859. 28,452ChamberlinMay 29, 1860. 117,70
and a spectroscope. The disks for the object-glass cost $7,000; the whole instrument, about $48,000; and the building for its accommodation, about $14,000. Next in size to this is a telescope constructed by Messrs. T. Cooke and Sons of York, England, for Mr. R. S. Newall, the contractor for the first Atlantic cable. This has an object-glass of 25 inches aperture and 29 feet focal length, and is represented as being a superior instrument. Another English telescope, constructed by Rev. Mr. Craig in connection with Mr. Cravatt, F. R. S., has a 24-inch object-glass, with a focal length of 76 feet, the length of the tube being 85 feet. This was mounted on Wandsworth Common. The great focal length of this appears remarkable, the tendency of late having been to reduce this as far as possible in proportion to the aperture of the lens. A telescope is now in course of construction in Dublin for the Austro-Hungarian government. Its object-glass will have an aperture of 27 inches, a