Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 623
ree portions of the horizon illumin-ated at the same time with a power equalto 2800 burners. The consumption of oil per lamp atBeachy Head is 44 gallons per annum, which, for 30 lamps, gives an aggregata combustion of 1320 galIons of oil each year. The aggregate power of light produced is 2800X3 =… … SEA-LIGHTS. 617 ■We have thus the following comparison: 1st order dioptric 570 galls, oil 5000X8 points = 40,000 1st catoptric 1320 2800X3 = 8,000 Saving in oil = 150 gallons per annum. Gain of light = 31,600 burners in eight points. Gain of light = 3,200 at any one point. The greater the amount of…
Mechanical engineering · Mechanics · Engineering
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