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Fitzhugh Lee, General Lee 14 0 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 3 1 Browse Search
Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 4. (ed. Frank Moore) 2 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
l light was produced. According to Fizeau and Foucault, the intensity of the electric light with a battery of 46 pairs of Bunsen burners was 235, that of the sun being taken at 1,000, while with 80 pairs it was but 238. During the excavation of the docks at Cherbourg two apparatus of this kind were employed, maintained by a single battery of 50 pairs of Bunsen, affording sufficient light for 800 workmen. The magneto-electric light was applied for illuminating the lighthouse at Dungeness, England, in 1862, and was introduced at La Heve, France, a year or two later. The machines employed at each are very similar in construction and entirely so in principle, the English apparatus being arranged after the following manner: — Eighty-eight bobbins or coils of copper wire are wound about an equal number of cores of soft iron, and arranged in two parallel rings, forty-four in each ring, at the circumference of a wheel 5 feet in diameter, their axes being parallel to that of the wh
Knight's Mechanical Encyclopedia (ed. Knight), L. (search)
ifth, and sixth being respectively 15 feet 6 inches, 14 feet, and 12 feet 6 inches. The columns of the first series are of wrought-iron, forged tapering; those above are of hollow cast-iron, each series successively decreasing in diameter. The lantern is supported on a cylinder of boiler-iron resting on a platform at the top of the columns. Lighthouse at Trinity shoals. The following is a list of the electric lights in England and France, with the dates at which they were erected: Dungeness, January, 1862; Cape La Heve, France, South Light, December, 1863, North Light, November, 1866; Cape Grisnez, France, February, 1869; Souter Point, England, January, 1871; South Foreland, England, with two lights, January, 1872, in the first place in 1858 – 60 by Professor Holmes, and afterward England took the lead in this matter of the adaptation of electric illumination to lighthouse purposes. The Bishop rock light, Scilly Islands, the old Cassiterides of Herodotus, 145 feet high, co