 | Royal Society of Edinburgh - Science - 1886 - 1098 pages
...Douglass patent gas burners are much more efficient and economical than the "Wigham gas burners." 5. " That for the ordinary necessities of lighthouse illumination,...oil is the most suitable and economical illuminant, and that for salient headlands, important landfalls, and places where a very powerful light is required,... | |
 | Royal Society of Edinburgh - Science - 1886 - 1120 pages
...Douglass patent gas burners are much more efficient and economical than the Wigham gas burners." 5. " That for the ordinary necessities of lighthouse illumination,...oil is the most suitable and economical illuminant, and that for salient headlands, important landfalls, and places where a very powerful light is required,... | |
 | 1885 - 358 pages
...the Douglass patent gasburners are much more efficient and economical than the Wigham gasburners. 5. That for the ordinary necessities of lighthouse illumination...oil is the most suitable and economical illuminant, and that for salient headlands, important landfalls, and places where a very powerful light is required,... | |
 | 1886 - 850 pages
...practical importance to navigation. The final conclusion of the Examining Committee was : ' That for ordinary necessities of lighthouse illumination, mineral...oil is the most suitable and economical illuminant ; and that for salient headlands, important landfalls, and places where a powerful light is required,... | |
 | Sir Norman Lockyer - Electronic journals - 1886 - 666 pages
...have the greatest penetrative power in fog ; " that for all practical purposes the gas and oil were equal; and " that for the ordinary necessities of...oil is the most suitable and economical illuminant, and that for salient headlands, important landfalls, and places where a very powerful light is required,... | |
 | Electrical engineering - 1885 - 784 pages
...the Douglass patent gas burners are much more efficient and economical than the Wigham gas burners, and that for the ordinary necessities of lighthouse...oil is the most suitable and economical illuminant ; and that for salient headlands, important landfalls, and places where a very powerful light is required,... | |
 | James Cameron (F.I.C.) - Oils and fats - 1886 - 392 pages
...recently reported on the relative cost and efficiency of electricity, gas, and oil as illuminants, and conclude that, " for all practical purposes, gas and...illumination, mineral oil is the most suitable and economical illuminant."—"Nature," 1886, 273. From Petroleum Oil. Price per gallon. d. 9 d. 7* ». d. IO d. Si... | |
 | Engineering - 1886 - 540 pages
...have the greatest penetrative power in fog " ; that for all practical purposes the gas and oil were equal ; and " that for the ordinary necessities of...oil is the most suitable and economical illuminant, and that for salient headlands, important landfalls, and places where a very powerful light is required,... | |
 | Sir Norman Lockyer - Science - 1886 - 884 pages
...have the greatest penetrative power in fog ; '' that for all practical purposes the gas and oil were equal ; and " that for the ordinary necessities of...oil is the most suitable and economical illuminant, and that for salient headlands, important landfalls, and places where a very powerful light is required,... | |
 | John Michels (Journalist) - Science - 1886 - 614 pages
...with their relative merits as lighthouse illuminants. The final conclusion of the experimenters was, that, for the ordinary necessities of lighthouse illumination,...oil is the most suitable and economical illuminant, and that for salient headlands, important land-falls, and places where a very powerful light is required,... | |
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that for the ordinary necessities of lighthouse illumination, mineral oil is the most suitable and economical illuminant, and that for salient headlands, important landfalls, and places where a very powerful light is required, electricity offers the... 
