Henry Draper Memorial First Fourth Annual Report of the Photographic Study O
Henry Draper Memorial First Fourth Annual Report of the Photographic Study O
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In one case, over three hundred spectra are shown on a single plate. This work has been carried on only in the intervals when the telescope was not needed for other purposes. 99 plates have however been obtained, and on these 4, 442 spectra have been measured. It is proposed to com- plete the equatorial zones first, gradually extending the work northward. In all, 15, 729 spectra of bright and faint stars have been measured.
8. Detailed Study of the Spectra of the Brighter Stars. This work has b...een carried . On with the 11-inch photographic telescope used by Dr. Draper in his later researches.
A wooden observatory was constructed about 20 feet square. This was surmounted FIRST ANNUAL REPORT. 9 by a dome having a clear diameter of 18 feet on the inside. The dome had a wooden frame, sheathed and covered with canvas. It rested on eight cast-iron wheels, and was easily moved by hand, the power being directly applied. Work was begun upon it in June, and the first observations were made with the telescope in October.
What to read after Henry Draper Memorial First Fourth Annual Report of the Photographic Study O?
You can find similar books in the "Read Also" column, or choose other free books by Harvard College Observatory to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In one case, over three hundred spectra are shown on a single plate. This work has been carried on only in the intervals when the telescope was not needed for other purposes. 99 plates have however been obtained, and on these 4, 442 spectra have been measured. It is proposed to com- plete the equatorial zones first, gradually extending the work northward. In all, 15, 729 spectra of bright and faint stars have been measured.
8. Detailed Study of the Spectra of the Brighter Stars. This work has b...een carried . On with the 11-inch photographic telescope used by Dr. Draper in his later researches.
A wooden observatory was constructed about 20 feet square. This was surmounted FIRST ANNUAL REPORT. 9 by a dome having a clear diameter of 18 feet on the inside. The dome had a wooden frame, sheathed and covered with canvas. It rested on eight cast-iron wheels, and was easily moved by hand, the power being directly applied. Work was begun upon it in June, and the first observations were made with the telescope in October.
What to read after Henry Draper Memorial First Fourth Annual Report of the Photographic Study O?
You can find similar books in the "Read Also" column, or choose other free books by Harvard College Observatory to read onlineMoreLess
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