 | John Gregory - 1842 - 328 pages
...brilliancy. This invention consists in a stream of oxygen gas directed through a flame of alcohol to a ball of lime, about a quarter of an inch in diameter, placed in the focus of a parabolic reflector. This produced light eighty times as intense as that produced by Argand's lamp. Any one having seen... | |
 | Sir Henry Edward Landor Thuillier - 1851 - 826 pages
...Heliotropes, Argand reverberatory lamps, and Drummond lights. The latter surpass all previous contrivances, a ball of lime, about a quarter of an inch in diameter,...of oxygen gas directed through a flame of alcohol, produces a light eighty times as intense as that given by an Argand burner, and is visible even in... | |
 | William Mitchell Gillespie - 1855 - 436 pages
...arrangement. For night signals, an Argand lamp is used ; or, best of all, Drummond's light, produced by a stream of oxygen gas directed through a flame of alcohol upon a ball of lime. Its distinctness is exceedingly increased by a parabolic reflector behind it,... | |
 | William Mitchell Gillespie - 1856 - 478 pages
...arrangement. For night signals, an Argand lamp is used ; or, best of all, Drummond's light, produced by a stream of oxygen gas directed through a flame of alcohol upon a ball of lime. Its distinctness is exceedingly increased by a parabolic reflector behind it,... | |
 | William Mitchell Gillespie - 1857 - 538 pages
...arrangement. For night signals, an Argand lamp is used ; or, best of all, Drummond's light, produced by a stream of oxygen gas directed through a flame of alcohol upon a ball of lime. Its distinctness is exceedingly increased by a parabolic reflector behind it,... | |
 | 1896 - 724 pages
...with great success during the progress of the Irish survey ; it simply consisted of a ball of lime, placed in the focus of a parabolic reflector, and...of oxygen gas directed through a flame of alcohol. The brightness of this light was so intense that on one occasion it rendered the station at Slieve... | |
 | William Mitchell Gillespie - 1868 - 530 pages
...arrangement. For night signals, an Argand lamp is used ; or, best of all, Drummond's light, produced by a stream of oxygen gas directed through a flame of alcohol upon a ball of lime. Its distinctness is exceedingly increased by a parabolic reflector behind it,... | |
 | 1878 - 534 pages
...arrangement. For night signals, an Argand lamp is used; or, best of all, Drummond's light, produced by a stream of oxygen gas directed through a flame of alcohol upon a ball of lime. Its distinctness is exceedingly increased by a parabolic reflector behind it,... | |
 | William Mitchell Gillespie - 1880 - 548 pages
...arrangement. For night signals, an Argand lamp is used ; or, best of all, Drum. mond's light, produced by a stream of oxygen gas directed through a flame of alcohol upon a ball of lime. Its distinctness is exceedingly increased by a parabolic reflector behind it,... | |
 | J. L. Robinson - 1882 - 356 pages
...generally observed by means of Drummond's Light* fixed on them. This consists of a ball of lime 1£ inches in diameter placed in the focus of a parabolic reflector...an intense heat by a stream of oxygen gas directed on it through a flame of alcohol. The light thus produced is 80 times as intense as that given by an... | |
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heliotrope," which is a piece of looking-glass, so adjusted as to reflect the sun directly to any desired point, is the most perfect arrangement. For night signals, an Argand lamp is used ; or, best of all, Drummond's light, produced by a stream of oxygen... 
