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Knight's Mechanical Encyclopedia (ed. Knight) 19 1 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), D. (search)
, y. Desic-ca′tion. The evaporation or drying off of the aqueous portion of bodies; practiced with fruit, meat, milk, vegetable extracts, and many other matters. It is usually done by a current of heated, dry air, and as such may be considered as distinguished from evaporators, so called, to which furnace heat or steam heat is applied. De-sil′ver-ing. The process of removing lead from an alloy with silver by means of removing crystals of the former from the cooling alloy. The Pattinson process. Desk. A sloping table, frame, or case for a writer or reader. In the illustration are several forms of school-desks. A shows a desk with a seat for the scholars in the row in front of it. A single seat is required for the rear row. B shows a desk and seat capable of folding for transportation and for sweeping. C, the seat only folds. Desk-knife. An craser. Des-tem′per. A mode of painting with opaque colors, principally used for walls, ceilings, domes, s<
Knight's Mechanical Encyclopedia (ed. Knight), L. (search)
er from comminuted ore by exposing it mechanically to molten lead, with which it forms an alloy. The subsequent separation is by cupellation or, with silver, by Pattinson's process. See infra. In reducing silver ores, the ancient Peruvians mixed them with galena or lead in portable ovens. It is still practiced in that countryd-sheets on roofs. 2. (Nautical.) A scupper-nail. Lead-pot. （Metallurgy.) A crucible or pot for melting lead. Lead from Sil′ver sep′a-rat-ing. Pattinson's method (English) of separating lead from silver is an economical substitute for cupellation. It is founded upon the property which pure lead has of crystaliziinclined hearth as to cause the alloy of lead and silver to run off, and allow the copper to remain. The lead and silver may be separated by cupellation or by Pattinson's process, in which the alloy is allowed to cool slowly and the crystals removed as they form, leaving the alloy relatively richer in silver. By a repetition of<
Knight's Mechanical Encyclopedia (ed. Knight), M. (search)
Slag. NickelSlakin. Nickel-plating.Sleeping-table. Niobium.Slimes. Ore-calcining.Slime-pit. Ore-concentrator.Sludge. Ore-crusher.Smeddum Ore-grinding.Smelter's fume. Oreide.Smelting. Ore-mill.Sodium. Ore-separator.Solder. Ore-stamp.Spalling. Or-molu.Speculum-metal. Oroide.Spelter. Orsedew.Sponge. Osleon-iron.Stamp Osmium.Stamp-head. Oxidizing-orc.Steel. PackSteely iron. Packfong.Sterro-metal. Palladium.Strake. Pan.Strip. Parting.Strontium. Patio-process.Sublimation. Pattinson's pots.Sullage. Pelopium.Sweeping-table. Percussion-sieve.Sweep-washings. Percussion-table.Taggers. Petong.Tain. Pewter.Tasting-hole. Pig.Temper. Piling.Tempering. Pina.Test. Pinchbeck.Tilted steel. Plating.Tin. Platinum.Tin-foil. Plomb-brut.Tinning-iron. Plush-copper.Tin-plate. Pocket.Tin-scraps. Utilizing Poling.Tinsel. Potassium.Titanium. Pot-metal.Tombac. Prill.Torta. Prillion.Tossing. Prince Rupert's metal.Touch-needle. Puddled-steel.Touchstone. Puddling.Tula-me
Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
he number of blows in regular order. 2. (Weaving.) A pattern-cylinder (which see). Pat′tin-son's pots. （Metallurgy.) An arrangement invented by Mr. H. L. Pattinson of Newcastle-on-Tyne, about 1829, for separating silver from lead. Lead ores always ćontain a small proportion of silver. By the ordinary process of cupellation, it does not pay to treat lead containing less than 20 ounces of silver to the ton for the purpose of extracting the silver, but by Pattinson's process that containing as little as 3 ounces per ton may be profitably worked. This process is based on the fact that the meltingpoints of alloys of silver and lead are higher , main flue. The ladles, if operated by hand, are about 16 inches in diameter and 5 inches in depth; when cranes are employed much larger ones may be used. Pattinson's pots. Paunch. 1. (Nautical.) A thickly thrummed mat of sennit wrapped around a spar or rope to keep it from chafing. 2. The rim of a bell. The par
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
s, being held to be a type of the condition of the human soul purified by trials and perfectly reflecting the face of Him who sits as a refiner and purifier of silver. In 1850, Mr. Alexander Parkes patented in England a process for extracting silver from lead by means of zinc. This is now employed in various works in Prussia and France; and it is claimed that ores containing but 8 ounces of silver to the ton can be profitably worked by it. The process is conducted in large cast-iron Pattinson pots, holding from 10 to 12 tons of lead. The lead is melted and the zinc introduced in three portions, the first being 2/3, the second 1/4, and the third 1/12 of the whole amount used. When the first portion is melted, it is mixed in by rabbles and perforated ladles, or by a mechanical stirrer, for 20 or 30 minutes, when the fire is withdrawn, the metal covered with wet coal-slack, and allowed to cool slowly; the zinc, having formed an alloy with the silver in the lead, rises to the sur
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
a. A cupel. b. A cupeling-hearth used in a refining-furnace where lead is separated from silver on a large scale. The test is an oval iron frame containing a basinshaped mass of powdered bone-ash, which is brought to a consistence by a solution of pearlash. The test is fixed as a cupeling-hearth in the reverberatory furnace, and is subjected to a blast from a tuyere, which removes the floating oxide of silver and furnishes oxygen for its elimination from the alloy under treatment. Pattinson's process has nearly superseded the plan just described. See silver from lead, extract-ing. 2. The proof of condition of a sirup, which is generally a matter of practice with the sugar-boiler, but has been reduced to a system by Payen. See proof. 3. In chemistry, a body which is used to detect the presence of another body in solution, indicating the said presence by a peculiar behavior, or by producing a specific effect. The behavior may be a change of color, as with litmus or t