Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 623
e 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, i,nves an a^rrretjate combustion of 1320 galIons of oil each year. The aggregate power of light produced is 2800X3… … SEA-LIGHTS. G17 We have thus the following comparison: 1st order dioptric 6TO galls, oil 5000X8 points =40,000 1st • catoptric 1320 • 2800X3 = B, I Saving in oil = 750 gallons per annum. Gain of light = 31,600 1 nailers in eight points. Gain of light = 3,200 at any one [mint. The greater the amount…
Mechanical engineering
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