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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
ng (rastrum); also as flakes for drying fruit. The latter were sometimes made of sedge or straw. Large crates were used in bridging fosses, protecting military engines, etc. Crawl. A pen of stakes and hurdles on the seaside, for fish. Cray. A small sea-vessel. Cray′on. 1. A colored pencil consisting of a cylinder of fine pipe-clay colored with a pigment. Black crayons are colored with plumbago, or made of Italian black chalk. A white crayon is a cylinder of chalk, comCray′on. 1. A colored pencil consisting of a cylinder of fine pipe-clay colored with a pigment. Black crayons are colored with plumbago, or made of Italian black chalk. A white crayon is a cylinder of chalk, common in England and France. Red chalk is found in France. The holder is a porte-crayon. Crayons are said to have been made in France in 1422, and imported thence into England in 1748. It is hard to say how long ago charcoal, chalk, and ochreous earths were used. Hans Holbein drew portraits in crayon in 1540. Sir Thomas Lawrence excelled in this style of portrait-painting, 1800 – 1830. 2. (Lithography.) A composition formed as a pencil, and used for drawing upon lithographic stones<
Knight's Mechanical Encyclopedia (ed. Knight), L. (search)
per cent. Its characteristics, as compared with dynamite, are: (1) greater sensitiveness to temperature, exploding at 120°, while dynamite explodes at 190°; (2) greater sensitiveness to moisture from the presence of the hygroscopic nitrate of soda; (3) the gases from the explosion always contain carbonic oxide from the carbon in the compound; (4) for equal volumes it has the less explosive power. — Journal of Applied Chemistry. Lith′o-glyph. An engraving on a gem. Lith′o-graph′ic Cray′on. In drawing on stone for the purposes of lithographic printing, crayons are used. They are composed essentially of soap, wax, fat, and lampblack, and are cast in the form of little cylindrical sticks. These are fastened in a portecrayon or quill in the ordinary way. The above constituents, with various additions of shellac, mastic, etc., are fused together and finally set on fire. The longer the mixture burns, the harder the product becomes; three or four grades are usually made
Knight's Mechanical Encyclopedia (ed. Knight), U. (search)
through the aperture e. The oil and sediment may be removed by unscrewing the plugs f g. Great variety is shown in the steps for spindles of spinningmachines. Ver′ti-cal steam-en′gine. One in which the piston reciprocates vertically, as distinguished from the horizontal, inclined, or rotary, — all common forms. Ver′vel. A silver name-ring around the leg of a hawk. Ves′sel. See under the following heads:— Argosy.Corvette. Ark.Cowan. Armor-plated vessel.Crane. Azogue.Cray. Bac.Cutter. Baggula.Dandy. Ballahore.Dhoney. Ballast-lighter.Dhow. Ballon.Dingy. Balsa.Dispatch-boat. Banker.Dogger. Barangay.Doney. Barca.Dory. Barcon.Dow (dhow). Barge.Dredge-boat. Bark.Drogher. Barquantine.Dug-out. Barque.Dummy. Batardates.Dwang. Bateau.Farcost. Becasse.Felucca. Bilalo.Ferry-boat. Bilander.Fire-ship. Bireme.Flat-boat. Bir-lin.Floating-battery. Boat.Floating-light. Bomb-ketch.Fly-boat. Brig.Fourth-rate. Brigantine.Frigate. Broad-horn.Frigatoo