 ... 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
 | Royal Society of Edinburgh - 1886 - 1098 ページ
...Douglass patent gas burners are much more efficient and economical than the "Wigham gas burners." 5. " That for the ordinary necessities of lighthouse illumination,...required, electricity offers the greatest advantages." There were employed during these experiments a variety of forms of photometer, but the most important... | |
 | Royal Society of Edinburgh - 1886 - 1120 ページ
...Douglass patent gas burners are much more efficient and economical than the Wigham gas burners." 5. " That for the ordinary necessities of lighthouse illumination,...required, electricity offers the greatest advantages." There were employed during these experiments a variety of forms of photometer, but the most important... | |
 | 1885 - 358 ページ
...the Douglass patent gasburners are much more efficient and economical than the Wigham gasburners. 5. That for the ordinary necessities of lighthouse illumination...required, electricity offers the greatest advantages. Thus is concluded a very important inquiry, which it may be hoped will set the question at rest for... | |
 | 1886 - 850 ページ
...practical importance to navigation. The final conclusion of the Examining Committee was : ' That for ordinary necessities of lighthouse illumination, mineral...headlands, important landfalls, and places where a powerful light is required, electricity offers the greatest advantages.' It may be noted as a matter... | |
 | Sir Norman Lockyer - 1886 - 666 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 lighthouse illumination,...required, electricity offers the greatest advantages." GEOGRAPHICAL EDUCATION 'T'HE Council of the Royal Geographical Society have •*• been making a determined... | |
 | 1885 - 696 ページ
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 | 1886 - 982 ページ
...committee are that for ordinary necessities of lighthouse illumination mineral oil is the most simple and economical illuminant ; and that for salient headlands,...required, electricity offers the greatest advantages. Heredity and Education. — " Heredity and Education ; their Relation to Each Other and to the Human... | |
 | 1885 - 784 ページ
...investigations, to establish the fact that "for the ordinary necessities of lighthouse illumination oil is the most suitable and economical illuminant, and that for salient headlands, important land falls, ami places where a very powerful light is required, electricity offers the greatest advantages."... | |
 | John Michels (Journalist) - 1886 - 718 ページ
...conditions, the oil-flames seem to be rather the better. They have also shown that the oil-lights can be superposed with the same facility as the gaslights....Journal of the Society of arts. The latter forge all the ddhs ('native hatchets') used by themselves and their' neighbors in the Hotha valley ; and they annually... | |
 | John Michels (Journalist) - 1886 - 618 ページ
...questions of convenience and economy assume the greater importance in connection with thenrelative merits as lighthouse illuminants. The final conclusion...of arts. The latter forge all the dahs ( ' native hatchete') used by themselves and their neighbors in the Hotha valley ; and they annually resort to... | |
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