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Knight's Mechanical Encyclopedia (ed. Knight) 47 3 Browse Search
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ety to resign, because he could not see with royal eyes. The knob theory has long since been entirely exploded. Sir W. Snow Harris's lightning-rod for land use consists of wide bands of copper or of copper tubing, the metal of either being 1/5 inthe tube terminates. The ground connection consists of a descending rod and a cross rod, giving 3 divergent branches. Harris's lightning-conductor for vessels converts the masts into lightning-conductors by the insertion in grooves of a double seh thick, 4 feet in length, and are secured by copper nails at intervals of 6 inches. According to the opinion of Sir W. Snow Harris and other eminent electricians, the insulation of a metallic conductor by inclosing it in a glass tube or by glass supports is unnecessary if the continuity of a sufficient conductor be preserved. Harris states that the electrical discharge does not quit an easy line of transit such as is furnished by a copper rod of sufficient size, to pass to other bodies out
rnment, and proceeded to erect works for the purpose. This patent was in 1684 renewed for thirty years, but in 1688 Abraham Thevart succeeded in casting at Paris plates of a size which astonished all who saw them; they were 84 inches long and 50 broad, while the largest of those previously made had not exceeded 45 or 50 inches in length. Among the more remarkable modern mirrors may be cited several of from 20 to 36 inches diameter. One made by Villette was tested by Drs. Desaguliers and Harris. It was composed of an alloy of tin, copper, and bismuth. It was 47 inches in diameter, and was ground to a sphere of 76 inches radius. Its effects were as follows: — Tin was melted in3 seconds. Cast-iron16 seconds. A silver sixpence7 seconds. A half-penny of George III.34 seconds. Slate3 seconds. Granite vitrified54 seconds. Copper ore8 seconds. Bone, calcined4 seconds. Tschirnhausen's mirror was 4 1/2 French feet in diameter; its focus, 12 feet. It vitrified pumice, sla
s h i j; the final pressure being applied by the rolls o o. This invention is particularly designed for manufacturing straw-board and other thick papers. In Harris's double-cylinder machine (Fig. 6, Plate XXXVII.), the left couching-roller a is placed at the left of the makingcylinder b, a gauze-covered roll e and solid rollhe hammers are transferred to different strings, by which means a composition is transposed half a note, a whole note, or a flat third lower at pleasure. In 1730 Harris took an English patent for his harpsichord, with two sets of strings, on which may be played either one unison or two; or two unisons and an octave together, and te as being heard, and also gradations and diversity of power, as in a violoncello, refer to the same versatility of expression. The name forte-piano occurs in Harris's English patent, 1740, but the instrument was a harpsichord. Silbermann made two hammer-harpsichords in 1736. His instruments, called forte-pianos, were play
e prolonged teeth to pass. At intermediate points, shorter teeth gear into each other to prevent passage of steam at this point. In v a jet of steam is forced against the vanes of a wheel as they are presented in turn in a steamtight case. Harris's rotary steam-engine. Fig. 4473 shows two views of the Harris engine, in which the portions are attached to two hubs and run in different directions. One axis with hollow trunnions carries the two radial arms which emit steam at their endsn the headstall to increase its freedom of motion. It frequently passes over sheaves on the bit and returns up the cheek, so as to pull the bit up into the angle of the mouth. See the following patents: — 70,089.Hannaford22, 10, 1867 63,886.Harris16, 4, 1867 56,213.Haines10, 7, 1866 64,970.Graham21, 5, 1867 43,308.Hartman28, 6, 1864 65,216.Hartman (anti-friction rollers)28, 5, 1866 59,596.Hartman13, 11, 1867 50,822.Hartman7, 11, 1865 79,334.Ferry30, 6, 1868 72,729.Fink31, 12, 1867
Jan. 13, 1857. 16,566GrayFeb. 3, 1857. 17,508HarrisJune 9, 1857. 17,571HarrisJune 16, 1857. 17,7HarrisJune 16, 1857. 17,717SageJune 30, 1857. 17,744LathburyJuly 7, 1857. 18,071BehnAug 25, 1857. 18,823MooreDec. 8, 1857. 31, 1858. 21,466ClintonSept. 7, 1858. 21,672HarrisOct. 5, 1858. 21,713WhiteOct. 5, 1858. 21,722v. 12, 1850. 9,139MillerJuly 20, 1852. 11,934HarrisNov. 14, 1854. 11,971ParhamNov. 21, 1854. 13,28, 1863. 55,927StannardJune 26, 1866. 67,536HarrisAug. 6, 1867. 79,983IsbellJuly 14, 1869. 88,625, 1857. 19,080DouglassJan. 12, 1858. 19,141HarrisJan. 19, 1858. 21,398RogersAug. 31, 1858. 22, (Reissue.)4,376MartinMay 9, 1871. 115,197HarrisMay 23, 1871. 116,195Judd et al.June 20, 1871.t. 3, 1871. 120,513HallOct. 31, 1871. 120,969HarrisNov. 14, 1871. 121,014SmithNov. 15, 1871. 121,356GoldsmithNov. 28, 1871. 121,516HarrisDec. 5, 1871. 124,206Goodrich et al.Mar. 5, 1872. 124,96ng engines, see portable engine; locomotive. Harris-Corliss engine. In the Corliss engine (Fig[3 more...]
al unit is a quantity of current that will decompose .143 grain of water, or generate 1.02 cubic inches of gas per second, the amount of zinc consumed in each cell being .513 grain. U′nit–jar. (Electricity.) An instrument devised by Sir W. Snow Harris for measuring definite quantities of electricity. It consists of a small Leyden jar a insulated by being mounted upon a glass rod b. Attached to the brass wire which connects the inner coating of the jar with an electrical machine is a s, Nov. 18, 1873. 144,623.Lamb. Nov. 18, 1873. 10,738.Goodyear, Ap. 4, 1854. 24,996.De Wolfe, Aug. 9, 1859. 23,151.Beins, March 8, 1859. 23,773.Mayall, April 26, 1859. 27,706.Eaton, April 3, 1860. 30,807.Falke et al., Dec. 4, 1860. 27,798.Harris, April 10, 1860. 23,855.Parmelee, May 3, 1859. 24,401.Parmelee, June 14, 1859. 10,339.Meyer, Dec. 20, 1853. 33,303.Gately, Sept. 17, 1861. 11,897Marcy, Nov. 7, 1854. 17,037.Herring, Ap. 14, 1867. 7,816.Trotter, Dec. 3, 1850. 10,586.Meyer,<