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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
ugh the port-holes, with their ends resting on the camel on each side. The ropes were made fast, the ship secured between the two parts of the camel, and the water pumped out, when they, of course, rose, bearing the ship up with them. By this apparatus, a vessel could be raised from four to six feet. A primitive arrangement of this sort was used by Perry in 1813, by which he succeeded in getting his two largest vessels, which drew too much water to cross the bar, out of the harbor of Erie, Penn., in the face of the enemy. The guns, loaded and shotted, were whipped out, landed, and placed in battery on the shore. A large scow was placed on each side of the vessel and filled with water; beams were passed through the ports, resting on blocking in the sunken scows, which were then pumped out, raising the vessels several feet. The camels used by Colonel Gowen, in removing the sunken vessels which obstructed Sebastopol harbor, had a lifting-power of 5,000 tons. They were nearly
Knight's Mechanical Encyclopedia (ed. Knight), R. (search)
sweeping parting of the hands on a level with the eyes, means go ahead. A downward motion of the hand, stop. A beckoning motion, back. A lantern raised and lowered vertically, start ; swung at right angles or across the track, stop ; swung in a circle, back. A red flag waved on the track, danger ; hoisted at a station, stop ; stuck up by the roadside, danger on the track ahead ; carried unfurled on an engine, another engine is on its way. Railway printing-press. The New York and Erie was the first road which constructed a line of telegraph to be used exclusively for transmitting messages in relation to the business of the road, and upon it was introduced the system now in general use of controlling the movement of the trains by telegraph. In this system the whole of the trains are under the control of a superintendent at headquarters, who is notified by the operator at his station of the time when each train arrives at his station. Having the time-table of the road be
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
horsepower annually, to hights varying from 60 to 188 feet; mean hight, 100 feet. Daily supply, 90 gallons per house. The New River Company supplies daily 700,000 persons with 40 gallons of water per head, at an expenditure of 4 cents per 1,000 gallons. At Wolverhampton, England, water from a well 140 feet deep was pumped over a stand-pipe 180 feet in hight, making a lift of 320 feet. This was done to give the necessary pressure in the mains, there being no summit reservoir. At the Erie, Pa., Water Works is a stand-pipe 220 feet in hight, resting on a rock elevated 14 feet above the water, making a total elevation of 234 feet. It is 5 feet in diameter, and is made of boiler-iron, the uppermost sections being 3/16 inch, and the lowermost 7/16 inch thick. It was erected by commencing with the top section and adding the lower ones in regular order, the whole being hoisted as each section was added, by means of a derrick and pulleys. Hights to which Water may be projected thro