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" ... whilst at the same zenith distance the sun's chemical brightness is only 36'6 times as great. Hence the value of this light as a source of the chemically active rays for photographic purposes becomes at once apparent. "
Journal of the Chemical Society - Page 518
by Chemical Society (Great Britain) - 1900
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The Chemical News and Journal of Industrial Science; with which is ..., Volume 9

1864
...distance is 67° 21' j whilst at the same zenith distance the sun's chemical brightness is only 36-6 times as great. Hence the value of this light as a source of the chemically active rays for photographic purposes becomes at once apparent. Professor Bunsen and...
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Proceedings of the Literary and Philosophical Society of Manchester, Volumes 3-7

Literary and Philosophical Society of Manchester - 1864 - 1170 pages
...the burning magnosium wire, whilst, at the same zenith-distance, the chemical brightness of the sun is only 36' 6 times as great. Hence the value of this light as a source of the chemically active rays for photographic purposes becomes at once apparent. The extract from the...
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Chemical News and Journal of Industrial Science, Volumes 9-10

1864 - 654 pages
...magnesium wire ; whilst, at the same zenithdistance, the chemical brightness of the sun is only 36-6 times as great. Hence the value of this light as a source of the chemically active rays for photographic purposes becomes at once apparent. The extract from the...
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THE JOURNAL OF THE PHOTOGRAPHIC SOCIETY OF LONDON.

HUGH W. DIAMOND, M.D., F.S.A. - 1866
...magnesium wire ; whilst, I at the same zenith-distance, the chemical brightness of the sun is only 36-6 times as great. Hence the value of this light as a source of the chemically active rays for photographic purposes becomes at once apparent. The extract from the...
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Ures̓ Dictionary of Arts, Manufactures and Mines: Containing a ..., Volume 3

Andrew Ure - 1867 - 1144 pages
...magnesium wire; whilst, at the same zenith distance, the chemical brightness of the sun is only 3(3 6 times as great. Hence the value of this light as a source of the chemically active ray e for photographic purposes becomes apparent. Professors Bunsen and Iloscoe...
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Spectrum Analysis: Six Lectures, Delivered in 1868, Before the Society of ...

Henry Enfield Roscoe - 1870 - 508 pages
...sun's zenith distance is 67° 22'; whilst at the same zenith distance the sun's chemical brightness is only 36 6 times as great. Hence the value of this light as a source of the chemically active rays for photographic purposes becomes at once apparent. Professor Bunsen and...
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Spectrum analysis, 6 lects

sir Henry Enfield Roscoe - 1869
...distance is 67° 22' ; whilst at the same zenith distance the sun's chemical brightness is only 36'6 times as great. Hence the value of this light as a source of the chemically active rays for photographic purposes becomes at once apparent. Professor Bunsen and...
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Spectrum Analysis -- Six Lectures

Henry E. Roscoe - 1869
...distance is 67° 22'; whilst at the same zenith distance the sun's chemical brightness is only 36*6 times as great. Hence the value of this light as a source of the chemically active rays for photographic purposes becomes at once apparent. Professor Bunsen and...
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Spectrum Analysis: Six Lectures, Delivered in 1868, Before the Society of ...

Henry Enfield Roscoe - 1873 - 542 pages
...distance is (\T '22'; whilst at the same zenith distance the sun's chemical brightness is only 36'6 times as great. Hence the value of this light as a source of the chemically active rays for photographic purposes becomes at once apparent. Professor Bunsen and...
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A Treatise on Chemistry, Volume 2

Henry Enfield Roscoe, Carl Schorlemmer - 1907
...sun's zenith-distance is 67° 22', whilst at the same zenith-distance the sun's chemical brightness was only 36 -6 times as great. Hence the value of this...of chemically active rays for photographic purposes becomes at once apparent. The light from burning magnesium has been employed for signalling, and 1...
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