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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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Harper's Encyclopedia of United States History (ed. Benson Lossing), Spain, War with (search)
m, and that this object should have the most solicitous attention from the authorities. The lessons taught by the expeditions made by the British in this section were of immense value. San Juan, in Porto Rico, had been attacked by Sir Ralph Abercrombie in 1795, unsuccessfully. He stated that the expedition had been undertaken too lightly, that he had found Porto Rico well supplied, and that there was powerful artillery there. Havana had been beseiged in 1762 by a large fleet, under Admiral Pocock, of the British navy, and a force of about 15,000 men under Lord Albemarle. This force was landed on June 5 in the same year. Havana surrendered after a siege on Aug. 13. It had been necessary to effect the reduction of the works, which were very strong, especially the Morro Castle, by regular approaches, and under very unfavorable circumstances. In this attack, about 5,000 troops from New England were used, yet two of the transports carrying them over were captured by the French,
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