 ... 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 520by Chemical Society (Great Britain) - 1900Full view - About this book
 | Royal Institution of Great Britain - 1866 - 742 pages
...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... | |
 | Franklin Institute (Philadelphia, Pa.) - 1864 - 526 pages
...magnesium wire, whilst, at the same zenith distance, the chemical brightness of the sun is only 3ti-l! 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... | |
 | 1865 - 786 pages
...distance is 67° 22' ; whilst at the same zenith distance, the sun's chemical brightness is only 36-C 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... | |
 | Franklin Institute (Philadelphia, Pa.) - 1864 - 526 pages
...67 degs. 22 mins. ; -whilst at the same zenith distance the sun's chemical brightness is only five times as great. Hence the value of this light as a source of the chemically active rays for photographic purposes becomes at once apparent. In the memoirs published... | |
| |
