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Knight's Mechanical Encyclopedia (ed. Knight), G. (search)
icular kind of tree which yields the juice. The tree is indigenous to the islands of the Indian Archipelago, and particularly to the Malayan peninsula, whose inhabitants have long used the gum for spear handles and other objects, formerly cutting down the tree for this purpose, but now, instructed as to its commercial value, collecting the juice in bowls or cocoa-nut shells from incisions made in the tree. It very soon hardens, and is ready for manufacture. It was first made known by Dr. Montgomery, in 1843; about the same time some was brought to London by Dr. D'Almeida. The former gentleman was rewarded by the London Society of Arts with a gold medal. The juice consolidates in a few minutes after being drawn, and is then formed by the hand into oblong masses about seven inches long and six inches thick. These generally contain bits of wood and other impurities, which may be removed by immersion in boiling water until the mass is sufficiently softened to be rolled out into a
Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
that, being turned in contrary directions in driving ahead, they may counteract each other's tendencies to produce lateral vibration. Propellers. Griffith's had a hollow spherical ball, forming an enlargement of the hub, being substituted for the central portion of the blades. The blades taper toward the extremities. The pitch is alterable, by the rotation of each screw on its stem, which is radial to the main shaft. Ericsson's blades were on the exterior of a cylinder. James Montgomery's propeller has a cylindrical rim around the outer edges of the wings, to prevent radial projection of the water and strengthen the wings. Patented April 12, 1859. A (Fig. 3974) shows a section of a three-decked vessel with a screw-propeller. To disconnect the propeller when the ship is under canvas, it is lifted into a hollow trunk m constructed over it in the stern of the vessel, entirely out of the water, the outer screw-shaft fitting into a vertical frame of gun-metal which ris
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
g. a, eye seizing. b, throat seizing. c e, round seizing. d, seizing secured with reef-knot. b. Binding two ropes, or the two parts of the same rope, together, by means of smaller stuff. Self-act′ing valve. One moved by the fluid, in contradistinction to one moved by the application of mechanical devices. Seizings. Self-clos′ing bridge. A pivot bridge opened by canal-boats in passing. Made by Snyder Brothers, Williamsport, Pa. See patents:— Schneider and Montgomery, September 4, 1860; Selsor, October 9, 1861; Winkler and Berndt, January 19, 1869; May 28, 1872; and October 8, 1872. Self-closing faucet. Self-closing Faucet. A faucet having a valve which is held down to its seat by a spring to prevent the escape of liquid, and is raised by means of a lever when the liquid is to be drawn off. The valve a has an opening to receive the tail of the lever b, by which it is raised when a liquid is to be drawn; at other times it is held down by a s<