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Knight's Mechanical Encyclopedia (ed. Knight) 6 0 Browse Search
Harper's Encyclopedia of United States History (ed. Benson Lossing) 1 1 Browse Search
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Browsing named entities in Knight's Mechanical Encyclopedia (ed. Knight). You can also browse the collection for Pocock or search for Pocock in all documents.

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Knight's Mechanical Encyclopedia (ed. Knight), A. (search)
umerous are the interstices in which the acid acts. A different ground is also obtained by a change of ingredients. Bergundy pitch, mastic, frankincense, and other resins, give various patterns of grounds, so to speak. Aque-duct. A conduit for the conveyance of water. More particularly applied to those of considerable magnitude intended to supply cities and towns with water derived from a distance for domestic purposes, or for conveying the water of canals across rivers or valleys. Pocock describes one erected by Solomon for conveying water from the vicinity of Bethlehem to Jerusalem. This was formed by earthen pipes about ten inches in diameter, encased with stone and sunk into the ground, and would seem to have conformed to its inequalities, indicating a more advanced state of hydraulic engineering in Solomon's time than is commonly supposed to have been possessed by the earlier Romans, who were justly famed for their works of this kind, which have never been surpassed in
Knight's Mechanical Encyclopedia (ed. Knight), K. (search)
s. It is also used for lodging a cord on steeples and other structures, to enable them to be fitted with lightning-rods or for the purpose of repair. The first wire of the foot Suspension-Bridge at Niagara was carried over by a kite. In 1827 Pocock yoked a pair of kites to a carriage, and traveled from London to Bristol. He determined that a 12-foot kite gave the power of a man, with a moderate breeze, and, when the wind is brisker, a power of 220 pounds. (This is an incomplete statement, s.) The force, he states, in a rather high wind, is as the squares of the lengths of the kites; and two kites, of 12 and 15 feet respectively, will draw a carriage and four or five passengers at the rate of 20 miles per hour. (Grade not stated.) Pocock had an extra line to vary the angle of the surface of his kite, so as to adjust its tractile force, and side lines to vary the direction of the motion till it came nearly to a right angle with the course of the wind. His kites were made of varn