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Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
early doubled. After the immersion it is washed in water, afterward in dilute ammonia, and if any of the latter remains it is removed by lime or baryta. It was invented and patented in England by Mr. Gaine. Figuer and Pomarede made attempts in the same direction in France, 1846. Karchiski, in 1860, subsequently treated the paper with glycerine, to give it suppleness. Stuart Gwynne made fractional currency of it about 1865 or 1866. To avoid the imperfect penetration of the acid, J. J. Ott treated a number of thin sheets with the acidulous solution, and combined them into a homogeneous sheet. A. T. Schmidt added the glycerine to the acid. Thomas Taylor (England, 1869; United States, 1871) treated the paper with chloride of zinc. See, — Hudson, March 16, 1869.Schmidt, April 4, 1871. Hudson, September 27, 1870, two patents.Hanna, October 31, 1871. Sheldon, January 25, 1870. Parclose. （Nautical.) The limber-hole. Pa-renthe-sis. A mark consisting of
Knight's Mechanical Encyclopedia (ed. Knight), R. (search)
nd fuel-chambers E E on each side of the reducing-chamber F, which is charged with finely comminuted ore. The hot-air blast is caused to pass into the reducing-chamber F alternately from the regenerators D D through openings b at its base. In Ott's furnace for reducing the precious metals (Fig. 4220), the ore, having previously been separated from a portion of its impurities, may be mixed with two to four per cent of sodium, potassium, calcium, magnesium, iron, copper, or with their hypoch a fine shower down the diving-flue, where the sulphureted hydrogen produced in the furnace precipitates the silver in form of sulphite. This is repeated several times. The sulphite is melted with iron, producing sulphuret of iron and silver. Ott's reducing-furnace for ores. Re-duc′tion-com′pass-es. Proportional dividers or whole-and-half dividers. Reed. 1. (Weaving.) Called also the sley or slay. An appurtenance of the loom, consisting of two parallel bars set a few inches
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
ace of the ship's skin, at the points where it rises toward each end of the vessel. Steps. A ladder for in-door use, such as for a library or for house-cleaning purposes. See step-ladder. Ste′re-o-bate. A base; the lower part or basement of a building or column. A stylobate. Stere-och′ro-my. The name is derived from words signifying solid color, the binding material being soluble glass. This silicious material protects the colors against atmospheric influences. From Ott we learn that Echter and Kaulbach, the artists of Munich, proceed as follows:— The wall to be painted is first coated with a layer of ordinary lime mortar, to equalize the surface, which must be exposed to the air for several days, so as to become entirely dry and carbonated, as the soluble glass afterward employed would be immediately decomposed by caustic lime. Professor Fuchs, the inventor of stereochromy, recommends moistening the wall with a solution of carbonate of ammonia, so as to<
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
d concentrated oil of vitriol. f. J. M. Patterson, of New Jersey, patented, in 1863, the use of a bath of melted lead, to form an alloy with the tin, which, suitable proportions of tin being added, may be used as solder. g. Mr. Everett, of New York, in 1865, proposed to use tinscraps in smelting galena. h. Sturdevant and Harmon, New York, propose to melt off the tin from the scraps by means of hot air and steam in a cylindrical retort with a perforated, inverted conical bottom. i. Ott's method consists in the solution of the tin and lead of the scraps in muriatic, with a slight admixture of nitric acid, the precipitation of the lead from this solution by means of sulphuric acid, and the final precipitation of the metallic tin by means of spelter. The iron scraps are washed first in water, then in a weak alkaline solution, then again in water, after which they are barreled and sent to the puddling-furnaces. The subject has been treated by M. Kuenzel in the Bergund Utta