 ... 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...  Science - 323 ページ 編集 - 1886全文表示 - この書籍について
 | 1887 - 690 ページ
...arrived at took this shape: — "That for ordinary necessities of lighthouse illumination, minerai 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, electricity offers the greatest advantages."... | |
 | 1887 - 692 ページ
...at took this shape: — "That for ordinary necessities of lighthouse illumination, uiiiiri ;i I nil is the most suitable and economical illuminant, and that for salient headlands, important land falls, and places where a very powerful light is required, electricity offers the greatest advantages."... | |
 | David Porter Heap - 1888 - 346 ページ
...necessities of light-house illumination mineral-oil is the most suitable and economical illuminant; for salient headlands, important landfalls and places...required, electricity offers the greatest advantages." A single oil-burner, placed on a focus of a proportionally sized lens, is sufficient for the generality... | |
 | David Porter Heap - 1888 - 352 ページ
...necessities of light-house illumination mineral-oil Is the most suitable and economical illuminant; for salient headlands, important landfalls and places...where a very powerful light is required, electricity offer* the greatest advantages." A single oil-hurner, placed on a focus of a proportionally sized lens,... | |
 | Royal Institution of Great Britain - 1889 - 642 ページ
...of Her Majesty, in 1885. The final conclusions of the Committee are given in the following words : " That for the ordinary necessities of lighthouse illumination,...required, electricity offers the greatest advantages." I have already referred to the necessity, with the present development of maritime commerce, that every... | |
 | Sir Norman Lockyer - 1889 - 942 ページ
...of Her Majesty, in 1885. The final conclusions of the Committee are given in the following words : "That, for the ordinary necessities of lighthouse...required, electricity offers the greatest advantages. " I have already referred to the necessity, with the present development of maritime commerce, that... | |
 | 1889 - 932 ページ
...ordinary necessities of light-house illumination mineral-oil is the most suitable and economical luminant, and that for salient headlands, important land-falls,...required, electricity offers the greatest advantages." The electric light referred to above is the arc light ; the Light-house Board is making experiments... | |
 | Smithsonian Institution. Board of Regents - 1889 - 822 ページ
...greatest penetrative power in fog ; that for all practical purposes the gas and oil were equal ; and that for the ordinary necessities of light-house illumination...oil is the most suitable and economical illuminant. They believe, however, that for salieut headlands, important land-falls, aud places where a very powerful... | |
 | 1889 - 810 ページ
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 | H. Joshua Phillips - 1891 - 398 ページ
...the Trinity House Committee conclude, that " for all practical purposes, gas and oil are equal," and that, "for the ordinary necessities of lighthouse...oil is the most suitable and economical illuminant." THE STORAGE OF PETROLEUM. Owing to the high degree of inflammability of petroleum oils, it is of importance... | |
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