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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
, and decanting it on to the table to be rolled into a plate. The cuvettes stand in openings in the sides of the furnace, and are filled with melted glass from the pots by means of iron ladles. The material remains sixteen hours in the pots and sixteen in the cuvettes. In casting, the cuvette is lifted by means of a grippingtongs, chains, and a crane, and the contents are poured upon the casting-table. 2. (Fortification.) A ditch in the main ditch. Cy′a-nom′e-ter. Invented by Saussure, for determining the depth of the tint of the atmosphere. A circular band of thick paper is divided into fifty-one parts, each of which is painted with a different shade of blue; the extremities of the scale being respectively deep blue and nearly white. The colored band is held in the hand of the observer, who observes the particular tint corresponding to the color of the sky. The number of this tint, reckoning from the light end, indicates the intensity of the blue. Cy-an′o-type. <
Knight's Mechanical Encyclopedia (ed. Knight), D. (search)
d by Arago are called negative artesian-wells, — a term more curious than profound. In former times the plain of Paluns, near Marseilles, was a morass, but was drained by means of absorbing-wells dug by King Rene; the waters thus carried off are said to have formed the fountains of Mion, near Cassis. The lake of Joux is supplied from the river Orbe in the Jura and the lake of Rousses, and has no visible outlet. It, however, maintains about an even level, and has evidently, as observed by Saussure, subterranean issues by which the waters are engulfed and disappear. The inhabitants of this valley keep up their absorbing-wells with care, and open new ones 15 to 20 feet in depth whenever the surface water appears to be too slowly carried off. The waters reappear in a large spring called Orbe, two miles below the southern extremity of the lake, issuing at a point 680 feet below the level of the surface of the lake. A potato-starch manufactory at Villetaneuse, three miles from St. Den
Knight's Mechanical Encyclopedia (ed. Knight), H. (search)
. Those in which the hygrometric condition is deduced from observations of a wet and a dry bulb. Hygrometers 1. a. Of the first class is the hygrometer of Saussure (died 1799). It consists of a human hair boiled in lye, and acts by absorption and evaporation, as shown at a, Fig. 2628. A piece of catgut may be made to extendon of the aqueous vapor contained in the atmosphere by organic substances, were provided with indexes and counterpoises, and were very similar in construction to Saussure's and Delue's hair and whalebone hygrometers; but the instruments of the seventeenth century were deficient in the determination of fixed wet and dry points, so f the hygrometic substances employed. Pictet, however, found that the hair of a Guanche mummy from Teneriffe, which might be a thousand years old, employed in a Saussure's hygrometer, still posseessed a satisfactory degree of sensibility. The admiral [Columbus], says Fernando Colon, ascribed the many refreshing falls of rain