 | Astronomy - 1858 - 404 pages
...degree of their luminosity. A very curious result, since to some extent confirmed by Professor Secchi, has been pointed out by Mr. De La Rue, namely, that those portions of the moon-s surface, which are illumined by a very oblique ray from the sun, possess so little photogenic... | |
 | Industrial arts - 1859 - 450 pages
...rays. Another curious fact, which he thought he had well made out, is, that those portions of the lunar surface which are illuminated by a very oblique ray from the sun, do not produce an equal effect on the sensitive plate, though they are equally bright to the eye. Such... | |
 | Literary and Philosophical Society of Manchester - Natural history - 1864 - 1170 pages
...following remarks: — " A very curious result, since to some extent confirmed by Professor Secchi, has been pointed out by Mr. De la Rue, namely, that...are illuminated by a very oblique ray from the sun possesses so little photogenic power, that, although to the eye they appear as bright as other portions... | |
 | George Frederick Chambers - Astronomy - 1867 - 888 pages
...A very curious result, since to some extent confirmed by Professor Secchi, has beeu pointed out by De La Rue, namely, that those portions of the Moon's surface which are illumined by a very oblique ray from the Sun possess so little photogenic power that, although to the... | |
 | Richard Anthony Proctor - Moon - 1873 - 472 pages
...A very curious result, since to some extent confirmed by Professor Secchi, has been pointed out by De La Rue, namely, that those portions of the moon's surface which are illumined by a very oblique ray from the sun possess so little photogenic power that, although to the... | |
 | George Frederick Chambers - Astronomy - 1877 - 968 pages
...'A very curious result, since to some extent confirmed by Professor Secchi, has been pointed out by De La Rue, namely, that those portions of the Moon's surface which are illumined by a very oblique ray from the Sun possess so little photogenic power that, although to the... | |
 | Royal Astronomical Society - Astronomy - 1890 - 798 pages
...positive, and equally obscure negative impressions ; and he also observed that those portions of the lunar surface which are illuminated by a very oblique ray from the Sun, do not produce an equal effect on the sensitive plate, though they are equally bright to the eye. At... | |
 | Photography - 1866 - 640 pages
...result, since to some extent confirmed by Professor Secchr, has been pointed out by Mr. De la Kue, namely, that those portions of the moon's surface...latter will produce the effect called by photographers solarizution, before the former (the obliquely-illuminated portions) can produce the faintest image.... | |
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Sccchi, has been pointed out by Mr. De la Rue, namely, that those portions of the moon's surface which are illuminated by a very oblique ray from the sun possess so little photogenic power that, although to the eye they appear as bright as other portions... 