The Astrophysical Journal, Volumul 10University of Chicago Press, 1899 "Letters to the Editor" issued as Part 2 and separately paged from v. 148, 1967. Beginning in 2009, the Letters published only online. |
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Pagina 19
... surface of only 1X2 inches , a photo- graph of Sirius was obtained which showed sixteen lines of the hydrogen series . This seemed so promising that a large grating was made , having a ruled surface of 2 × 534 inches . This grat- ing ...
... surface of only 1X2 inches , a photo- graph of Sirius was obtained which showed sixteen lines of the hydrogen series . This seemed so promising that a large grating was made , having a ruled surface of 2 × 534 inches . This grat- ing ...
Pagina 29
... surface of only 1X2 inches , a photo- graph of Sirius was obtained which showed sixteen lines of the hydrogen series . This seemed so promising that a large grating was made , having a ruled surface of 2 × 534 inches . This grat- ing ...
... surface of only 1X2 inches , a photo- graph of Sirius was obtained which showed sixteen lines of the hydrogen series . This seemed so promising that a large grating was made , having a ruled surface of 2 × 534 inches . This grat- ing ...
Pagina 38
... surface of 111⁄2 inches , which is less than the surface of the objective of a 4 - inch telescope . Taking into account the exposure required as well as the excel- lent definition obtained and the accuracy of the measurements , we see ...
... surface of 111⁄2 inches , which is less than the surface of the objective of a 4 - inch telescope . Taking into account the exposure required as well as the excel- lent definition obtained and the accuracy of the measurements , we see ...
Pagina 43
... surface of the bolometer was blackened either with lampblack or according to the Lum- mer - Kurlbaum method with platinum black . The layer of black was given two or three times the thickness prescribed in their rule or employed in my ...
... surface of the bolometer was blackened either with lampblack or according to the Lum- mer - Kurlbaum method with platinum black . The layer of black was given two or three times the thickness prescribed in their rule or employed in my ...
Pagina 44
... surface bolometer , which of course must be opaque for its whole breadth . The visual observation of the spectrum projected upon the exterior wall of the hemis- phere is effected by a properly adjusted mirror . Since the bolometer strip ...
... surface bolometer , which of course must be opaque for its whole breadth . The visual observation of the spectrum projected upon the exterior wall of the hemis- phere is effected by a properly adjusted mirror . Since the bolometer strip ...
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absorption aperture apparatus appear astronomers ASTROPHYSICAL JOURNAL axis bands blackening Board of Visitors bolometer bright lines brighter camera carbon catalogue cents chromosphere cluster Coin comparison compound spectrum corona corresponding curve density determined diameter disk displacement eclipse electrodes employed equal error exposure faint stars Fe lacking focal length given gives Harvard College Observatory hydrogen lines inches instrument intensity investigation Keeler Lick Observatory light line of sight luminosity magnitude maximum mean measured mercury vapor Messier 13 metallic meteors micrometer mirror Morris Travers Naval Observatory objective observations obtained orbit oxygen photographs photometric Pickering plate position Potsdam pressure prism Professor radiation rays refractor region ring nebula Scheiner screw slit spark spectra spectrograph spectroheliograph spectroscope stellar telescope temperature tenth-meters tion trum tube University of Chicago Ursae vanadium Variable Stars Variable Velocity visual W. W. Campbell wave-lengths wedge Widely separated Yerkes Observatory
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Pagina 49 - EMGs were sampled with surface electrodes for ten revolutions at the beginning, in the middle and at the end of each work...
Pagina 272 - When an appointment or detail is to be made to the office of astronomical director, director of the Nautical Almanac, astronomer, or assistant astronomer, the board of visitors may recommend to the Secretary of the Navy a suitable person to fill such office, but such recommendation shall be determined only by a majority vote of the members present at a regularly called meeting of the board held in the city of Washington.
Pagina 197 - The officers of the Society shall consist of a President, two Vice Presidents, a Secretary...
Pagina 197 - Society to serve for a period of one year, and two members shall be chosen annually to serve for a period of two years or until their successors are duly elected and qualified.
Pagina 272 - The board of visitors shall prepare and submit to the Secretary of the Navy regulations prescribing the scope of the astronomical and other researches of the Observatory and the duties of its staff with reference...
Pagina 357 - PRINTERS AND BINDERS THE PRINTING OF BOOKS DEMANDING TASTE AND CAREFUL EXECUTION, PRIVATE EDITIONS, COLLEGE CATALOGUES AND ANNUALS A SPECIALTY. WE PRINT MORE FINE BOOKS THAN ALL OTHER HOUSES WEST OF NEW YORK. OUR NEW FACTORY, RUN ENTIRELY BY ELECTRICITY, IS THE MOST ADVANCED PRINTING PLANT IN THE COUNTRY. THE LAKESIDE PRESS BLDG., PLYMOUTH PLACE, COR. POLK, CHICAGO.
Pagina 384 - Sold in quart bottles only, by Druggists and high-class Grocers. Prepared only by Henry B. Platt, Platt Street, New York.