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Knight's Mechanical Encyclopedia (ed. Knight), A. (search)
required in grinding and polishing the faces of each piece so that they may have the proper curvature and fit accurately together, achromatic lenses have always been and will probably continue to be very expensive, especially the larger sizes. Dr. Dick mentions one of 5 1/2 inches aperture and 5 1/2 feet focal length, which cost 200 guineas. Plopl, an optician of Vienna, has recently invented an improvement on the achromatic, which he calls the dialytic telescope, in which the several diffeases the quads of the forms afford teeth by which the column is advanced. Barrington, June 14, 1859. The cylinder has grooved ribs for holding forms of type and presenting them consecutively at the proper point for delivering an impression. Dick's addressing machine. Marshall, November 1, 1859. The forms constitute links of an endless chain, which unwinds from one drum and winds on to another, being inked on their passage by one set of devices, and the consecutive links depressed by
Knight's Mechanical Encyclopedia (ed. Knight), D. (search)
g the eye by their combinations and by the soft harmony of their contrasts. Many beautiful variations may be obtained by using several films of sulphate of lime having their axes variously inclined to one another. For other forms of this instrument see Encyclopedia Edinensis, Vol. XV. pp. 653, 654, and plate ccccxlii. Dic′ing. A mode of ornamenting leather in squares or diamonds by pressure, either of a blunt awl or an edging-tool, or in a machine by pressure between dies. Dick′ey. A seat behind the body of a carriage for servants. In the old-fashioned English stagecoach it was occupied by the guard and some passengers. Die. 1. (Metal-working.) a. In punching-machines, a bed-piece which has an opening the size of the punch, and through which the piece is driven. This piece may be a planchet or blank, or it may be merely a plug driven out of the object to form a bolt or rivet hole. In nut-machines the nuts-blanks may be made by one die and punched by an
Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
ws a modification, in which the rails are flanges of a hollow box or trunk c, the lower side of the box having a continuous longitudinal slit, allowing the passage of the suspension-bar. The mode of propulsion is probably by a wire or rope. Dick's elevated railway (English patent, 1825) had a double track supported on vertical pillars m m of varying hight when crossing irregular surfaces, so as to preserve a level, or nearly so. The track has two rails, upon which the wheels n of the cevated by a perpendicular lift operated by compressed air. In India, Australia, and some other places, it has not been unusual to cross gullies and rivers by means of a bucket or basket suspended from a cord. The patents of Palmer, Fisher, and Dick, already cited, are an amplification of this idea, a carriage being arranged to travel on a rail. The idea has recently been reduced to practice in a compact and useful form. See wire-way. El′e-vating—block. A tackle-block used in eleva
Knight's Mechanical Encyclopedia (ed. Knight), F. (search)
his manner. This paper uses a single large sheet of 43 × 47 inches, making twenty-four pages, and, with the added cover, twentyeight. The sheet is printed on a four-cylinder press, and, by an ingenious arrangement of rollers and tapes, fed mechanically from the impression-cylinders into four folding-machines, an attendant being at each machine to secure accurate pointing. This economy of time in feeding, etc., makes easily possible the printing, folding, pasting, trimming, and mailing (by Dick's system) of nearly 150,000 papers every week, within two and a half working days. Folding-valve. 2. (Metal.) One which bends pans and tin-ware to form. Some are rollers, others presses, and yet others act like the envelope-machine, having hinged leaves which press up the sides against a former. Fold′ing—net. A bird-net shuting upon its prey. Fold′ing-valve. A flexible flap which lies upon the perforated plate forming its seat, and rolls or unrolls thereupon to open or c
Knight's Mechanical Encyclopedia (ed. Knight), G. (search)
passage to the exhaust gases. f is the induction slide, admitting the explosive mixture to the cylinder. g is the compressor by which the inflammable gas is introduced into the chamber where the mixture is formed. i is the reservoir of inflammable gas. j j are the fixed jets, and k k the movable. In Hugon's English patent 653 of 1863, the explosive force of the gas acts upon a column of water which transfers the force to the piston. See also Lenoir's patent, March 19, 1861; Dick's, 1867; Million, 1867. The ammoniacal engine has been termed a gasengine, but this latter name is more fairly applicable to those engines in which the force is obtained by the inflammation of the charge, rather than to those in which the motor is an elastic vapor under pressure. Frot's ammonia-engine resembles the steam-engine so closely that comparative experiments with the vapor of water and of ammonia have been made with it. See ammoniacal engine. R. Waller (English patent, No.
Knight's Mechanical Encyclopedia (ed. Knight), R. (search)
platform on wheels or rollers, driven up the glacis and intended to span the ditch, to admit the assaulting column into the works. Roll′ing-cam press. A press operated by a roller revolving between cam-wheels. This movement was invented by Dick, about 1848. Dick's anti-friction press. In the figure, a a′ are the sectors, the lower one of which has a bearing in a groove in the lower fixed bed, and the upper in a groove in the movable bed above; their faces are in contact with the ecDick's anti-friction press. In the figure, a a′ are the sectors, the lower one of which has a bearing in a groove in the lower fixed bed, and the upper in a groove in the movable bed above; their faces are in contact with the eccentric journals of the cam-wheels b b′, which rise and fall between guides on the standards e, and between which the roller c is interposed; on depressing the lever d to which this roller is attached, the sectors are caused to rotate into the position shown, bringing the longer axes of the cams into perpendicular position, thereby raising the upper bed. Rolling-chock. Roll′ing-chocks. （Nautical.) Jaws on a yard to steady it against the mast when a ship rolls. Roll′ing-col
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
8, 1873. 145,687RichardsonDec. 16, 1873. 153,428DucheminJuly 28, 1874. 155,932DrakeOct. 13, 1874. 158,883BallouJan. 19, 1875. class D. — feeding. 1. Needle. No.Name.Date. 18,732ChaseDec. 1, 1857. 58,614DavisOct. 9, 1866. 125,774WeeksApr. 16, 1872. 146,505BeckwithJan. 20, 1874. 2. Wheel or Band. 11,680ShawSept. 12, 1854. 12,856Chilcott et al.Jan. 12, 1855. 13,065SingerMar. 15, 1855. 16,518AlexanderFeb. 3, 1857. 17,825BartholfJuly 21, 1857. 23,823ClarkMay 3, 1859. 26,816DickJan. 10, 1860. 27,412PaineMar. 6, 1860. 31,805HicksMar. 26, 1861. 32,517HowellJune 11, 1861. 43,514MackJuly 12, 1864. 43,705PhelpsAug. 2, 1864. 43,890Auger et al.Aug. 23, 1864. 48,204PlanerJune 13, 1865. 48,206PlanerJune 13, 1865. 55,847GallethJune 26, 1866. 56,730DeweyJuly 31, 1866. 57,116GallethAug. 14, 1866. 57,287ChickenAug. 21, 1866. 64,184StannardApr. 23, 1867. 68,420DollSept. 3, 1867. 89,501PrattApr. 27, 1869. 91,149MillerJune 8, 1869. 101,779SpoehrApr. 12, 1870. 112,0
Knight's Mechanical Encyclopedia (ed. Knight), W. (search)
e, the revolution of the pinions twists the wire. Wire-way. A wire or wire-rope suspended from posts, and forming a way upon which loaded carriages traverse for the conveyance of freight. This mode of transportation was described and represented in a work written by Mandey and Moxon, and published in London in 1696. Hodgson's wire-tramway, lately introduced into England, is substantially similar to the elevated railways which were patented in England in 1825 by Palmer, Fisher, and Dick. See elevated Railway. An endless wire-rope is carried on a series of grooved pulleys, supported in pairs upon stout posts ordinarily about fifty yards, but in some cases at much farther intervals apart. At one end the rope passes around a clip drum, worked by a stationary engine; at the other end it passes around a plain cylinder. In one erected in Leicestershire, for conveying stone from the quarry to a railway station, a distance of three miles, the rope, 1/2 inch in diameter, is