Publications of the Astronomical Society of the Pacific, Volumes 3-4Astronomical Society of the Pacific, 1891 |
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Page 27
... exposure , and yet success depends principally upon this trying operation ! It is one thing to make a proper exposure , and another to secure , in the development of the latent image , its most delicate details . It requires judgment ...
... exposure , and yet success depends principally upon this trying operation ! It is one thing to make a proper exposure , and another to secure , in the development of the latent image , its most delicate details . It requires judgment ...
Page 28
... exposure . No doubt we should always aim at a correct exposure . In developing a well- timed plate we may expect a minimum of difficulties : but how seldom in out - door photography will an exact exposure be obtained ! In photographing ...
... exposure . No doubt we should always aim at a correct exposure . In developing a well- timed plate we may expect a minimum of difficulties : but how seldom in out - door photography will an exact exposure be obtained ! In photographing ...
Page 29
... exposure , and a fogged plate is the inevitable consequence . One of the negatives of Prof. PRITCHETT'S party , taken at Norman , Cal . , January , 1889 , received an exposure of 30 seconds . Although the polar filaments are almost ...
... exposure , and a fogged plate is the inevitable consequence . One of the negatives of Prof. PRITCHETT'S party , taken at Norman , Cal . , January , 1889 , received an exposure of 30 seconds . Although the polar filaments are almost ...
Page 30
The same exposure may give all the result of an under - timed picture with one developer , and of an over - timed ... exposures on the crescent moon . All the plates used were Seed's 26 ; time one - fourth of a second . In developing ...
The same exposure may give all the result of an under - timed picture with one developer , and of an over - timed ... exposures on the crescent moon . All the plates used were Seed's 26 ; time one - fourth of a second . In developing ...
Page 32
... exposure is much reduced by using the short focus grating . The rooms are so con- nected by double doors that it is possible to pass through them all without disturbing any plates which may happen to be exposed . They are lighted by ...
... exposure is much reduced by using the short focus grating . The rooms are so con- nected by double doors that it is possible to pass through them all without disturbing any plates which may happen to be exposed . They are lighted by ...
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Common terms and phrases
angle aperture appears Astronomical Astronomical Society atmosphere August axis bright BURCKHALTER California Street Catalogue Chicago Section chronometer Comet Committee copies corona coronal pole crater dark diameter Directors disc distance drawings E. E. BARNARD eclipse elected elongated equator equatorial exposure eye-piece HOLDEN inches instrument J. M. SCHAEBERLE July Jupiter Jupiter's KEELER latitude Library Lick Observatory light limb London longitude lunar magnitude means meeting meridian meridian circle meteors minutes Miss CLERKE MOLERA Moon Mount Hamilton nebula negatives object observations obtained Pacific parallax Paris photographic PIERSON planet plates polar position present Prof Professor WEINEK proper motions Publications radiant rays reference book right ascension ring San Francisco satellite SCHMIDT Secretary seen shadow solar spectra spectrum spot stars stellar sun-spots sun's telescope temperature tion TRANSIT OF MERCURY U. S. Naval Observatory University visible W. H. S. MONCK W. W. CAMPBELL Washington Zodiacal light