Reports of Observations of the Total Eclipse of the Sun August 7 1869
Reports of Observations of the Total Eclipse of the Sun August 7 1869
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+ 70 to 4- 90; a diffuse mass with many detached clouds.
2. 4- 146; very bright, but not large.
3 130; an enormous and very bright protuberance the principal one. 4. -- 7o-75; a long, low, but pretty bright mass.
Besides these, several smaller ones were seen whose positions were not noted owing to the near approach of the eclipse.
FIRST CONTACT.
I had not intended to make any observation upon the time of contact, considering the spectroscope an unsuitable instrument for the purpose; but about h...alf an hour before the event was to take place it occurred to me that, on the contrary, th'e spectro- scope could be made to give results superior in value to any that could possibly be obtained by other methods, excepting, perhaps, the data deduced by calculation from measurement upon photographs. Accordingly, I connected myself with the chrono- graph.
When the telescopes and collimator of the instrument are properly focused, and the limb of the sun is made to bisect the slit nearly at right angles, the spectrum in the neighborhood of the C line presents the appearance I have indicated in Plate III, Figure 2.
What to read after Reports of Observations of the Total Eclipse of the Sun August 7 1869?
You can find similar books in the "Read Also" column, or choose other free books by United States Naval Observatory Nautical Almanac to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
+ 70 to 4- 90; a diffuse mass with many detached clouds.
2. 4- 146; very bright, but not large.
3 130; an enormous and very bright protuberance the principal one. 4. -- 7o-75; a long, low, but pretty bright mass.
Besides these, several smaller ones were seen whose positions were not noted owing to the near approach of the eclipse.
FIRST CONTACT.
I had not intended to make any observation upon the time of contact, considering the spectroscope an unsuitable instrument for the purpose; but about h...alf an hour before the event was to take place it occurred to me that, on the contrary, th'e spectro- scope could be made to give results superior in value to any that could possibly be obtained by other methods, excepting, perhaps, the data deduced by calculation from measurement upon photographs. Accordingly, I connected myself with the chrono- graph.
When the telescopes and collimator of the instrument are properly focused, and the limb of the sun is made to bisect the slit nearly at right angles, the spectrum in the neighborhood of the C line presents the appearance I have indicated in Plate III, Figure 2.
What to read after Reports of Observations of the Total Eclipse of the Sun August 7 1869?
You can find similar books in the "Read Also" column, or choose other free books by United States Naval Observatory Nautical Almanac to read onlineMoreLess
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