| Harvard University. Board of Overseers - 1877 - 298 pages
...stars brighter than the sixth magnitude with sufficient distinctness for measurement. The greater 8 portion of the sky north of — 30° has been surveyed...brightest stars. For this work Mrs. Draper has lent the 11 -inch photographic lens employed by her husband. She has also furnished an admirable mounting for... | |
| John Michels (Journalist) - 1887 - 742 pages
...important new work of the observatory is in the field of stellar photography. For this investigation Mrs. Draper has lent the 11-inch photographic lens employed by her husband, the late Dr. Henry Draper, at his observatory on the Hudson, and has provided means for ite new mounting,... | |
| John Michels (Journalist) - 1887 - 702 pages
...important new work of the observatory is in the field of stellar photography. For this investigation Mrs. Draper has lent the 11-inch photographic lens employed by her husband, the late Dr. Henry Draper, at his observatory on the Hudson, and has provided means for its new mounting,... | |
| Smithsonian Institution. Board of Regents - 1889 - 822 pages
...photographs of stellar spectra have been obtained, i'or continuing the researches upon a stellar spectra Mrs. Draper has lent the 11-inch photographic lens employed by her husband, the late Dr. flcury Draper, and has provided means for a uew mounting at Cambridge, and for the proper... | |
| Smithsonian Institution. Board of Regents - 1889 - 774 pages
...been measured, and of these 2,359 have been identified. In both of these investigations the 8-iuch Bache telescope has been employed. The third research...object-glass, the large one having a clear aperture of 11 inches square and an angle of nearly 15°, the other being somewhat smaller. The preliminary results... | |
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