Nature, Volume 35Nature Publishing Group, 1886 |
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Página 42
... lights are ex- hibited , expressing in figures their estimate of the relative brightness of the three lights . keepers are instructed to patrol the line of posts , and to record When the night is misty the the distance at which each light ...
... lights are ex- hibited , expressing in figures their estimate of the relative brightness of the three lights . keepers are instructed to patrol the line of posts , and to record When the night is misty the the distance at which each light ...
Página 46
... light is surrounded by an apparatus which gathers together the light sent forth in all directions , excepting a small angle above and below . Thus , the intensity of the light sent in a sloping direction upwards and downwards is of as ...
... light is surrounded by an apparatus which gathers together the light sent forth in all directions , excepting a small angle above and below . Thus , the intensity of the light sent in a sloping direction upwards and downwards is of as ...
Página 61
... light ceases to be visible . Thus it is possible to calculate for any particular degree of haze what will be the range of any given light . To give some examples : -In a moderate uniform haze such that a single 108 - jet gas - burner ...
... light ceases to be visible . Thus it is possible to calculate for any particular degree of haze what will be the range of any given light . To give some examples : -In a moderate uniform haze such that a single 108 - jet gas - burner ...
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