The American Encyclopedia And Dictionary of Ophthalmology volume 17
The American Encyclopedia And Dictionary of Ophthalmology volume 17
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In our eReader you can find the full English version of the book. Read The American Encyclopedia And Dictionary of Ophthalmology volume 17 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 The American Encyclopedia And Dictionary of Ophthalmology volume 17
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) light. Also, as is to be expected, the absorbed energy per lumen of light flux incident upon the retina rapidly decreases with an increase of temperature of the source. It will be noted that about thirty times as much energy is absorbed in the total eye per lumen of tungsten light as per lumen of light from a black body at 5000° C. As Luekiesh 13030 TRANSMISSION OF RADIANT ENERGY says: "This same ratio would hold approximately for sunlight if it were not for the moisture in the atmosphere whi...ch absorbs much of the infra-red rays before they reach the eye. This is perhaps fortunate considering the enormously greater intensities of illumination en^ countered in daylight. " For instance, according to F. E. Fowle (Astrophysical Jour. 1913) the amount of percipitable water existing in the form of atmospheric water vapor averages about 0. 7 cm.
The marked difference between the action of water and the eye toward the infra-red on the one hand and the ultra-violet on the other hand is noteworthy.
What to read after The American Encyclopedia And Dictionary of Ophthalmology volume 17?
You can find similar books in the "Read Also" column, or choose other free books by Casey a Casey Albert Wood to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
) light. Also, as is to be expected, the absorbed energy per lumen of light flux incident upon the retina rapidly decreases with an increase of temperature of the source. It will be noted that about thirty times as much energy is absorbed in the total eye per lumen of tungsten light as per lumen of light from a black body at 5000° C. As Luekiesh 13030 TRANSMISSION OF RADIANT ENERGY says: "This same ratio would hold approximately for sunlight if it were not for the moisture in the atmosphere whi...ch absorbs much of the infra-red rays before they reach the eye. This is perhaps fortunate considering the enormously greater intensities of illumination en^ countered in daylight. " For instance, according to F. E. Fowle (Astrophysical Jour. 1913) the amount of percipitable water existing in the form of atmospheric water vapor averages about 0. 7 cm.
The marked difference between the action of water and the eye toward the infra-red on the one hand and the ultra-violet on the other hand is noteworthy.
What to read after The American Encyclopedia And Dictionary of Ophthalmology volume 17?
You can find similar books in the "Read Also" column, or choose other free books by Casey a Casey Albert Wood to read onlineMoreLess
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