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" They showed 1 that a burning surface of magnesium wire, which, seen from a point at the sea's level, has an apparent magnitude equal to that of the sun, effects on that point the same chemical action as the sun would do if shining from a cloudless sky... "
Spectrum analysis, 6 lects - Page 40
by sir Henry Enfield Roscoe - 1870
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Spectrum Analysis: Six Lectures, Delivered in 1868, Before the Society of ...

Henry Enfield Roscoe - 1873 - 542 pages
...point the same chemical action as the sun would do if shining from a cloudless sky at a height of 9° 53' above the horizon. On comparing the visible brightness...magnesium wire, when the sun's zenith distance is (\T '22'; whilst at the same zenith distance the sun's chemical brightness is only 36'6 times as great....
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A Treatise on Chemistry, Volume 2

Henry Enfield Roscoe, Carl Schorlemmer - 1913
...point, the same chemical action as the sun would do if shining from a cloudless sky at the height of 9° 53' above the horizon. On comparing the visible brightness...of these two sources of light it was found that the 1 Adie, Proc. Chem. Soc., 1899, 133. 2 Kippenberger, Chem. Zei/., 1895, 19, 269; Vital!, L'Omxi, 1895,...
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Annual Report of the Board of Regents of the Smithsonian Institution

Smithsonian Institution. Board of Regents - 1901
...point the same chemical action as the sun would do if shining from a cloudless sky at the height of 9° 53' above the horizon. On comparing the visible brightness...light, it was found that the brightness of the sun's disk, as measured by the eye, is 524.7 times as great as that of burning magnesium when the sun's zenith...
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Pharmaceutical Journal: A Weekly Record of Pharmacy and Allied Sciences

1865 - 786 pages
...point the same chemical action as the sun would do if shining from a cloudless sky at a height of 9° 53 above the horizon. On comparing the visible brightness...brightness of the sun's disc, as measured by the eye, is .">24'7 times as great as that of burning magnesium-wire when the sun's zenith distance is 67° 22'...
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Journal of the Franklin Institute

Franklin Institute (Philadelphia, Pa.) - 1864 - 526 pages
...chemical action as the sun would do if shining from a cloudless sky at a height of 99 degs. 53 mins. above the horizon. On comparing the visible brightness...light, it was found that the brightness of the sun's disk as measured by the eye, is 524 times as great as that of burning magnesium when the sun's zenith...
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Journal of the Franklin Institute, Volume 77

Franklin Institute (Philadelphia, Pa.) - 1864 - 526 pages
...shining from a cloudless sky at a height of 9° 53' above the horizon. On comparing the chemical with the visible brightness of these two sources of light it was found that the brightness of the sun's disk as measured bv the eye when the sun's zenith distance was G7° 22', is 524-7 times as great as...
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