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Knight's Mechanical Encyclopedia (ed. Knight), M. (search)
may refer to a mural attachment, as in the case of the mural circle, for measuring arcs of the meridian. The instrument is permanently attached to a perpendicular wall. Mu-sette′. （Music.) A name by which the bagpipes are known among some of the European conti- nental nations. Named from a mountebank performer. Mush′room—an′chor. An anchor with a central shank and a head like a mushroom, so that it can grasp the soil however it may happen to fall. Invented by Hemman of Chatham, England, 1809. See anchor. That used by the United States Lighthouse Board for anchoring buoys is shaped like an inverted saucer, having a shackle and chain attached to the center of its convex side. The chain is just long enough to give the buoy sufficient prominence above the surface and allow for the rise and fall of tides. Mushroom-anchor. It imbeds itself in the ground, offering a strong resistance to an upward pull and not a little to a lateral one. a, can-buoy with anc
Knight's Mechanical Encyclopedia (ed. Knight), R. (search)
eans by which the process was effected hardly deserving to be called machines. A machine for this purpose was patented in England by Richard March in 1784, and another by Edward Cartwright in 1792. In 1805, Captain Huddard invented a series of machines, in which some of the features of the latter were introduced, by which hemp was successively combed, straightened, spun into yarns, tarred, twisted into strands, and finally laid up into rope. These were introduced into the dockyard at Chatham, England, and effected a great improvement in the manufacture of cables and cordage. See also English patents, — Sylvester, 1783; Seymour, 1784; Fothergill, 1793; Balfour, 1793, 1798; Chapman, 1797, 1799, 1807. In the year 1820, machinery was introduced into the United States from England, for working the spun yarn into strands and ropes. Mr. Treadwell introduced his rope-making machinery in 1834. In the ordinary process of manufacture, the hemp, having been heckled and formed into ske
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
h vessels are moored on each side, or it may be fixed on an overhead traveling gantry. The works of the crane (Fig. 5653) are carried on a flatbot-tomed boat, which may be towed from place to place and moored by attachment to piles. The pile or other object to which the end of the boat opposite the derrick is fastened serves as a fulcrum to resist the strain of heavy weights, as well as to hold the boat in place. Steam Railway-crane. The steam-crane of the Royal Gunwharf at Chatham, England, is one of the largest and most powerful steamcranes in the world. While capable of lifting the 80-ton guns, it is under the control of one man. In its erection a bed of concrete 30 feet deep was first laid, to which the main framing is firmly screwed down with an intervening base-plate. On this base-plate is a centerpin or bolt, 12 inches diameter, on which the crane revolves. Two cast-iron rollers 3 feet diameter and 1 foot broad run in a roller-path, and by suitable gearing bet