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Knight's Mechanical Encyclopedia (ed. Knight), L. (search)
f the boat be upset, the heavy iron keel and the filled water-tanks near the bottom, aided by the light air-cases near the top, tend to right it. It is rigged with a lug foresail and a mizzen. The draft of water, with thirty persons on board, is about two feet; the weight of the boat and its fittings is about three tons and a half, and the cost £ 250. It is capable of carrying seventy-five persons with safety. The boat of the National Life-Boat Institution, England, is the invention of Mr. Peake, master shipwright of Devonport Dockyard. It is a strong boat, 30 feet long, 8 feet beam, and rowed by 8 to 12 oars, double-banked. It is nearly flat-bottomed, but the bow and stern rise 2 feet higher than the midship portion. Running along the upper part of each side, and occupying 4 feet at each end, are airtight chambers, which impart sufficient buoyancy to float the boat and crew when the boat is filled with water. The iron keel weighs 800 pounds, and in connection with the curved
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
d used a combination of two convex lenses, the image being inverted; to this he afterward added two other glasses which again reversed the images, making them appear in their natural position. Gig-saddle, with terrets. Ter′ret. （Saddlery.) A ring attached to the pad or saddle and hames of harness, through which the drivingreins pass. Ter′ri-er. An auger. A wimble. Ter′ro-met′al. A composition of several clays, possessing, when baked, peculiar hardness, introduced by Mr. Peake, a potter, of Burslem, England. It is principally employed for making tiles of various kinds. Ter′ry. （Rope-making.) An open reel. Ter′ry-fab′ric. （Weaving.) (Fr. tirer, to draw, to draw out.) A pile fabric, such as plush or velvet; probably from the drawing out of the wires over which the warp is laid to make the series of loops seen in Brussels carpet or uncut velvet. In some looms for weaving pile fabrics, mechanism is employed for actuating the wires