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Knight's Mechanical Encyclopedia (ed. Knight), A. (search)
201111 Gold solders are made from gold of the quality of the article, say 18 or 16 carats, to which is added 1/12 of silver and one 1/24 of copper; or a larger proportion of silver and copper for ware of inferior fineness. jeweler's alloys. Brass.Copper.Tin.Zinc.Silver.Platinum.Arsenic.Antimony.Glass. Blanched Copper (Mock Silver)161 Imitation Gold (Hermstadt's); (this resembles gold in color and specific gravity)7116 Semilor51 Manheim Gold41 or31/41 Mosaic Gold (Hamilton and Parker's Patent)3233 Pinchbeck52 Mock Platinum85 Bath Metal329 Very hard Bronze (Chantrey's)3255 Speculum Metal743 Speculum Metal621 Speculum Metal11 Martin's Patent, Aug. 23, 185910018 3/41610/16 Or Molu4852 Tombac (Malay, tambaga, copper)1611 Red Tombac111Lead.Nickel. Mock Silver (Toucas's Patent, 1856, England）511141 Mock Gold (Hackert's, patented June 11, 1867), cream of tartar, 8 oz; saltpeter, 1 oz; melt, and add melted copper, 8 oz.; borax, 1 oz.; zinc, 1 oz.; tutty, 1 oz.
Knight's Mechanical Encyclopedia (ed. Knight), B. (search)
s, Machlin's Bible, ornamented by Tomkins, was valued at £ 525. A superb copy of the Bible was printed and collected by Mr. Parker, of Golden Square, London, in about 54 large folio volumes, with 7,000 illustrations in the text and mounted, and contablack letter), the binding of which is embroidered by Queen Elizabeth; around the borders are Latin sentences, etc. Archbishop Parker's De Antiquitate Britannicae Ecclesiae (1572), in the British Museum, is bound in green velvet, embroidered with anles）91.405.531.701.37 Chantrey's hard alloy3255 Manheim gold41 Manheim gold311/4 Semilor51 Mosaic gold (Hamilton and Parker's patent)3233 Mock platinum85 Bath metal329 White brass108010 Ormolu4852 Speculum metal (Martin's patent, August 23,sed in a few seconds, and grains of platinum were melted sufficiently to cohere, but not to form a spherical drop. The Parker lens or burning-glass was made in London at a cost of $3,500. It was of flint glass, 36 inches in diameter, double convex
Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
a saturated solution of alum and re-calcined. Mix with water, and apply as plaster-of-paris. This cement or stucco is susceptible of a high polish, and may be colored to imitate marbles. See also stone; granite; infra. mastic (Bottger's). Sand, limestone in powder, litharge, combined, 100 parts; boiled linseed-oil, 7 parts. Mix. Similar to Loriat's French mastic, invented 1750. mortar. a. Sharp, clean sand, 3; freshly slacked lime, 1. See beton; stone, artificial; mortar. b. Parker's cement, known as Roman, patented in England in 1796, is made by adding a quantity of calcined and powdered argillaceous stone to the usual constituents of mortar, namely, sharp sand, lime, and water. Cements from sulphate of lime : — c. Keene's cement is made from plaster-of-paris mixed with a saturated solution of alum, dried, baked, powdered, and sifted. d. Parian cement, same as above, with the substitution of borax for alum. e. Martin's cement, same as above, with the addit
Knight's Mechanical Encyclopedia (ed. Knight), D. (search)
s, or by the succession in which those heddles are moved in the working. The heddles being stretched between two shafts of wood, all the heddles connected by the same shafts are called a leaf; and as the operation of introducing the warp into any number of leaves is called drawing a warp, the plan of succession is called a draft. Draft-bar. 1. A swingle-tree, double or single. 2. The bar of a railway-car with which the coupling is immediately connected. Draft-box. Invented by Parker. An air-tight tube by which the water from an elevated wheel is conducted to the tail-race. It is a means of availing the whole fall without placing the wheel at the bottom of the same. It is sometimes used to avoid extreme length of wheel-shaft; at other times to conform the arrangements to the peculiar location, rendering it necessary to place the wheel at a distance above tail-water. Draft-en′gine. （Mining.) An engine (usually steam) for elevating ore, coal, miners, etc., o
Knight's Mechanical Encyclopedia (ed. Knight), F. (search)
st forms of the Argand, — the student's lamp, for instance. Gerard used an air-pump to force oil from a low chamber to the burner of an Argand lamp, so as to avoid throwing a shadow upon surrounding objects. Fountain-pen. Foun′tain-pen. One which has an ink reservoir for the supply of the pen. Scheffer's fountain-pen, introduced in England about 1835, had a reservoir of ink in the holder, and the ink is admitted to the pen by the pressure of the thumb on a projecting stud. Parker's hydraulic pen, invented about the same time, had a piston in the holder, operated by a screw stem and a nut on the end of the holder. The lower end of the reservoir being dipped in ink, the piston was drawn up by rotating the nut, filling the reservoir. The ink was ejected as required by the contrary motion of the thumbnut. Fountain-pump. Foun′tain-pump. 1. One in which a stream with a natural head is led through a stock and nozzle, and thus bears the appearance of a pump, thou<
Knight's Mechanical Encyclopedia (ed. Knight), H. (search)
e quantities on the Lower Rhine, is used in Germany. For lining their reservoirs, the Romans employed pure lime and finely pounded brick. The principal supply is, however, derived from various limestones which contain insoluble matters, as silica, alumina, magnesia, and oxide of iron, in varying proportions. These are burned, causing chemical changes and combinations in the constituents of the mass, which is then pulverized for use. The so-called Roman cement, patented in England by Parker in 1796, is prepared from nodular concretions of limestone, usually containing veins of calc spar, found in beds of clay. Portland cement, which ranks among the highest in point of tenacity and durability, is made from the deposits formed in the beds of some rivers which flow through chalk and clay formations, mixed with a proportion of carbonate of lime. These are incorporated under water, burned, and ground. Several varieties of hydraulic cement are prepared in the United States, wh
Knight's Mechanical Encyclopedia (ed. Knight), L. (search)
in a mass, and when annealed and cooled, separating unstriated portions by cleavage, afterwards softening the piece in clay molds which gave the shape. The plan has been pursued by his successors. A powerful lens was made some years since by Parker of London. It was of flint-glass, 3 feet in diameter; 3 1/4 inches thick at the center; focal distance, 6 feet 8 inches; diameter of the burning focus, 1 inch; weight, 212 pounds. The rays refracted by this lens were received on another, the dia with much exactness, the direction of the horizon, the perpendicular to the horizon, and vertical angles; and that it is easier to make, more convenient to use, and indicates a level line more readily and accurately than any other instrument. Parker's level (b) consists of a glass tube of small bore, the two ends being bent at right angles and closed. The ends are about three inches high, and marked at a certain level; the tube is charged with quicksilver, so as to stand at the marked point
Knight's Mechanical Encyclopedia (ed. Knight), M. (search)
e Pac. Mock gold. A yellow alloy. Factitious gold. Copper.Platinum.Magnesia.Zinc.Tin.Borax.Sal-ammonia.Saltpeter.Lime.Tartar.Putty. Hermstadt's (resembles gold in color and specific gravity)7161 Hackert's patent16222162 Hamilton and Parker's3233 Pinchbeck42 Manheim gold1641 Red tombac111 Ormolu4852 Prince's metal21 New formula1006173.61.69 See also jewelers' alloys, page 63. Mock Plat′i-num. Brass, 8; zinc, 5. Mock Sil′ver. A white-metal alloy for jewelers. no other contrivance could guarantee. The piece No. 3 has evidently been sawn from such a stick of glass as above described and broken off. They were found at Sakkarah. Mo-sa′ic gold. A brass used for making cheap jewelry. Hamilton and Parker's: copper, 32; zinc, 33. Or, copper, 4; zinc, 1. Hermastadt's: copper, 7; zinc, 1; platinum, 16. Resembles gold in color and weight. See alloy ; mock gold. Mo-sa′ic Pave′ment. One laid in colored tiles or slabs arranged in systema
Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
nt position of the pen and the hand. Scheffer's fountain-pen was introduced about 1835 by Mordan. The pressure of the thumb on a stud in the holder caused a continuous supply of ink to flow from the reservoir to the pen. See fountain pen. Parker's hydraulic pen (English) has a piston which works up and down in a tube by means of a screw stem and a revolving nut on the end of the holder. Fig. 3616 shows several forms of pens. Pens. a is a pen with a broad flat nib made for markiounces of the composition is allowed in an establishment at one time. Metallic cartridge-shells are primed with fulminate and varnished in the inside in the same way as caps, but the tin-foil is generally dispensed with. The separate caps for Parker's and Maynard's, and some other central-fire cartridges are made in the same manner as guncaps, but the shells are shallower. They are inserted in depressions in the head of the cartridge, the head of the cap on a line with the surrounding shell
Knight's Mechanical Encyclopedia (ed. Knight), R. (search)
sion, and a bob which traverses the longer, graduated limb. See steelyard. Roll-lathe. Ro′man-can′dle. （Pyrotechnics.) a. A tube (an old gun-barrel sawn off short is best) is partially filled with alternating perforated stars and small charges of gunpowder. Fire communicated to the upper end ignites the charges successively, which throw out the stars until all are discharged. b. A similar firework in paper tube. Ro′man-cem′ent. A kind of cement originated about 1812, by Parker, of London. The term Roman is a misnomer. Septaria — nodules of indurated clay with lime and iron — are burned, ground, and mixed into a mortar with lime and sand. It hardens very quickly, and is very durable. See pozzuolana; hydraulic cement; cement. Ron′dle. （Metal-working.) A round plate or disk. The term is applied to the crust or scale which forms upon the surface of molten metal in cooling, and which is removed from the crucible or cistern from time to time as
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