Artificial Light, Its Influence Upon Civilization
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In our eReader you can find the full English version of the book. Read Artificial Light, Its Influence Upon Civilization Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Artificial Light, Its Influence Upon Civilization
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Sometimes the lens or reflector is revolved and in other types an opaque screen containing slits is revolved.
In the larger lighthouses the optical apparatus and its structure sometimes weigh several tons. When it is necessary to revolve apparatus of this weight, the whole mechanism is floated upon mercury contained in a cast-iron vessel of suitable size, and by an ingenious arrangement only a Simall portion of mercury is re- quired.
The characteristics of navigation lights are varied considera...bly in order to enable the mariner to distin- guish them and thereby to learn exactly where he is.
The fixed light is liable to be confused with others, so it has now become a minor light. Flashes of short duration followed by longer periods of darkness are extensively used. The mariner by timing the inter- vals is able to recognize the light. This method is ex- tended to groups of short flashes followed by longer intervals of darkness. In fact, short flashes have been employed to indicate a certain number so that a mariner could recognize the light by a number rather than by means of his watch.
What to read after Artificial Light, Its Influence Upon Civilization?
You can find similar books in the "Read Also" column, or choose other free books by Luckiesh, Matthew, B. 1883 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Sometimes the lens or reflector is revolved and in other types an opaque screen containing slits is revolved.
In the larger lighthouses the optical apparatus and its structure sometimes weigh several tons. When it is necessary to revolve apparatus of this weight, the whole mechanism is floated upon mercury contained in a cast-iron vessel of suitable size, and by an ingenious arrangement only a Simall portion of mercury is re- quired.
The characteristics of navigation lights are varied considera...bly in order to enable the mariner to distin- guish them and thereby to learn exactly where he is.
The fixed light is liable to be confused with others, so it has now become a minor light. Flashes of short duration followed by longer periods of darkness are extensively used. The mariner by timing the inter- vals is able to recognize the light. This method is ex- tended to groups of short flashes followed by longer intervals of darkness. In fact, short flashes have been employed to indicate a certain number so that a mariner could recognize the light by a number rather than by means of his watch.
What to read after Artificial Light, Its Influence Upon Civilization?
You can find similar books in the "Read Also" column, or choose other free books by Luckiesh, Matthew, B. 1883 to read onlineMoreLess
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