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Knight's Mechanical Encyclopedia (ed. Knight), F. (search)
and that much of the surface-sand is frequently removed, portions of the area at a time. An acre of area filters 300,000 to 400,000 cubic feet daily. A natural filter is used at Nottingham, England, the reservoir being dug in such position as to receive its water by percolation from the river through a bed of fine sand, which intervenes between the two. The sedimentary matter is continually washed away from the river face of the filter by the action of the stream. The filter of Greenock, Scotland, is a tank 50 feet long, 12 wide, and 8 deep. The water percolates either upward or downward through the filtering material as it may be directed. After the filter has become foul, by opening a sluice the water is turned in the other direction, passing upward through the filter, and passing off by a waste-sluice. After the water is cleansed, the sluices are changed and the filter operates as before. There are three of these filters in the works. The filter of Paisley (c, Fig. 19
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
Fulton afterward devoted his attention to a submarine battery, for which he obtained a patent in 1813. In 1814 a steam man-of-war was launched under the name of Fulton the first. He died in 1815 Bell's steamboat, the Comet, was built in Greenock, and plied in 1812 between Glasgow and Greenock. It had 40 feet keel, 10 1/2 feet beam, was fitted with a portable engine of 3 horsepower, and was propelled by paddle-wheels. He lost money by the operation, but had a safe, practical boat whichGreenock. It had 40 feet keel, 10 1/2 feet beam, was fitted with a portable engine of 3 horsepower, and was propelled by paddle-wheels. He lost money by the operation, but had a safe, practical boat which made trips all round the coasts of the British Islands. Bell's boat, comet. In 1814, there were 5 steamers making regular passage in Scottish waters, and none in England or Ireland In 1820, England had 17; Scotland, 14; Ireland, 3. In 1840, it stood thus: England. 987; Scotland, 244; Ireland, 79. The Majestic was navigated from Glasgow to Dublin in 1814, by Dodd. In 1817, 7 steamboats plied on the Thames under Dodd's direction. A Parliamentary commission of 1817 stated the necessit