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Knight's Mechanical Encyclopedia (ed. Knight), B. (search)
arpsichord, etc. Another class is represented by the piano-forte and dulcimer, the strings being vibrated by a hammer. Another by the air; as the aeolian. Bow-i′ron. （Vehicle.) The staple on the side of a wagon-bed which receives the bows of the tilt or cover, as in Fig. 845. Bow-iron. Bowk′ing. The process of boiling in an alkaline lye in a kier. Bucking. Bowl. （Knitting-machine.) A roller or antifriction wheel, on which the carriage traverses. A truck, in Nottingham parlance. 1. An open vessel of segmental or frusto-conical form, for containing liquids; larger and proportionately less deep than a cup. The Thibetans have no porcelain, but their potteries are, nevertheless, of great excellence. The wooden bowls, which every one carries, are made of the root of certain trees which grow on the mountains of Thibet. They are of a simple but elegant form, and have no other decoration than a slight coating of varnish, which does not hide either the
Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
e common telegraph key. In fire alarms and many automatic telegraphs, it is a plain metallic disk with insulated spaces on the rim or edge. A flat spring pressing upon the edge closes the circuit when upon the metallic portion, interrupts it when on the insulated portion. See dial. In place of metallic and insulated spaces, projections or cogs are sometimes used, the interdental spaces answering the purpose of insulated spaces. Cir′cu-lar bolt. A machine employed by the Nottingham, England, lace manufacturers in making net. Cir′cu-lar file. A circular saw or serrated disk, adapted to run on a spindle or mandrel, and used in cutting teeth of cog-wheels. Cir′cu-lar In′stru-ments. Astronomical, nautical, or surveying instruments which are graduated to 360° that is, around the whole circle. Of this kind are altitude, azimuth, mural, reflecting, and repeating circles; circumferentors (which see). Circular loom. Cir′cu-lar loom. A loom in which th
Knight's Mechanical Encyclopedia (ed. Knight), F. (search)
The sediment penetrates to a depth of from 6 to 9 inches, and that much of the surface-sand is frequently removed, portions of the area at a time. An acre of area filters 300,000 to 400,000 cubic feet daily. A natural filter is used at Nottingham, England, the reservoir being dug in such position as to receive its water by percolation from the river through a bed of fine sand, which intervenes between the two. The sedimentary matter is continually washed away from the river face of the fils. Natural filters consisting of beds of gravel or sand intervening between a pumping well and a muddy river or sea water, as the case may be, are found in many places; Dayton, Ohio, and Cape Cod may be mentioned, in addition to that at Nottingham, England, just cited. The filter for sirups is charged with bone-black, revived from time to time by reburning to consume the absorbed organic matter. As a mere filter, cloth covered with paper pulp has been used successfully for sirups. See s
Knight's Mechanical Encyclopedia (ed. Knight), N. (search)
anner of fishing-nets by shuttle and mesh-stick. A substitute for nets for horses consists of leather strings, with a few hands to keep them in place at their proper distance apart. Net-ma′son-ry. Reticulated bond, the joints of which resemble in appearance the meshes of a net. Net′ting. Open-work fabric for curtains or screens. See musquito-canopy, etc. Net′ting-ma-chine′. Lace is said to have been first made by machinery in 1768 by Hammond, a stocking-weaver of Nottingham, England, who invented what was known as the pin-machine, for making single-press point-lace in imitation of Brussels ground. The warp-frame for making warp-lace was introduced in 1782. The first attempt to make bobbinet by machinery was in 1799, but no successful machine was produced prior to 1809, when Heathcote patented his machine, in which, by means of bobbins, a series of diagonal weft-threads are passed around and intertwisted with the parallel threads of the warp. Many subsequent
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
del together, and soon afterward Kay is lost sight of in the matter. They were miserably poor, and probably Kay became tired of the chase. Need and Strutt, of Nottingham, assisted Arkwright, who took out several patents, the most important one in 1769. It may be mentioned that Kay turned up again in after years to assist in ilast century and the first quarter of the present one. A mob, instigated by jealous rivals, broke into his house and destroyed his machine. He then removed to Nottingham, rebuilt his machine, took out a patent, and lived comfortably on the proceeds of his machine, though his patent was infringed and he made nothing by an exclusisengers were made up, stood it, does not appear. In 1677 there was a Chester, in 1679 a Birmingham, and in 1680 a Bedford coach. In 1682 the journey between Nottingham and London occupied four days (130 miles). The coaches had projections, called boots, on each side, where passengers sat with their backs to the body of the car
Knight's Mechanical Encyclopedia (ed. Knight), W. (search)
ut 80°, with the axis, the concavity facing the wind. The breadth of the sails is usually about 1/5 or 1/6 of the length, which varies from 30 to 40 feet, and they are preferably widened toward their outer extremities. Their maximum effect is attained when their outer ends revolve with about 2 1/2 times the velocity of the wind. In 1772 Andrew Meikle, of Scotland, invented a plan for automatically adjusting the area of the sails to the force of the wind; and in 1804, By water of Nottingham, England, patented a method of rolling up the sails to adjust them in like manner, by means of a weighted lever, which was caused to operate gears, connected by cords to cylinders, on which the sails were wound. More recent devices of this kind generally aim to effect this adjustment by altering the angle at which the sails are presented to the wind. In some cases the axis on which the sails rotate is caused to fall in the line of direction of the wind by means of a vane of considerable