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 30
... prism trains , there is no absorption of the ultra- violet light , except the small selective absorption of speculum metal ; and since no slit is used no light is cut off by this means . Consequently the photographic spectrum extends ...
... prism trains , there is no absorption of the ultra- violet light , except the small selective absorption of speculum metal ; and since no slit is used no light is cut off by this means . Consequently the photographic spectrum extends ...
Pagina 33
... prism or a grating - show a spectrum made up of images of the object photographed . Thus , in the present photo- graphs , the lines of the spectrum consist of a series of images of the nebula . Although the stars in the immediate ...
... prism or a grating - show a spectrum made up of images of the object photographed . Thus , in the present photo- graphs , the lines of the spectrum consist of a series of images of the nebula . Although the stars in the immediate ...
Pagina 42
... prism loaned me by the firm of Carl Zeiss , which I had used before , and two silver concave mirrors of 35 cm focus , with pre- cisely spherical figure , and so arranged that the astigmatism of the image was reduced as much as possible ...
... prism loaned me by the firm of Carl Zeiss , which I had used before , and two silver concave mirrors of 35 cm focus , with pre- cisely spherical figure , and so arranged that the astigmatism of the image was reduced as much as possible ...
Pagina 43
... prism was removed ) became as nearly as pos- sible an isosceles triangle , as the correction for the impurity of the spectrum due to the width of the slit can be simply cal- culated for this case . ' The exposed surface of the bolometer ...
... prism was removed ) became as nearly as pos- sible an isosceles triangle , as the correction for the impurity of the spectrum due to the width of the slit can be simply cal- culated for this case . ' The exposed surface of the bolometer ...
Pagina 46
... prism . In this region the four wave - lengths , 7.738 μ , 8.246μ , 8.806μ and 9.324μ were investigated , account being taken of the absorption by the prism . For the calculation of the normal energy spectrum , in which the energy ...
... prism . In this region the four wave - lengths , 7.738 μ , 8.246μ , 8.806μ and 9.324μ were investigated , account being taken of the absorption by the prism . For the calculation of the normal energy spectrum , in which the energy ...
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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.