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 137
... but the general appear- ance of the spectrum was observed , and photometric measure- ments of the luminosity of selected parts or lines made 137 THE EFFECT OF CERTAIN IMPURITIES ON THE SPECTRA OF SOME GASES Percival Lewis.
... but the general appear- ance of the spectrum was observed , and photometric measure- ments of the luminosity of selected parts or lines made 137 THE EFFECT OF CERTAIN IMPURITIES ON THE SPECTRA OF SOME GASES Percival Lewis.
Pagina 138
ments of the luminosity of selected parts or lines made , at various pressures of the gas . Small quantities of the foreign substances were then introduced and the observations repeated . In order to guard against disturbances due to ...
ments of the luminosity of selected parts or lines made , at various pressures of the gas . Small quantities of the foreign substances were then introduced and the observations repeated . In order to guard against disturbances due to ...
Pagina 140
... luminosity is pro- portional to the current strength . ' Photometric measurements were made with a Glan spectro- photometer , with an ordinary glowlamp , behind a screen of oiled paper , as a standard . As relative values only were ...
... luminosity is pro- portional to the current strength . ' Photometric measurements were made with a Glan spectro- photometer , with an ordinary glowlamp , behind a screen of oiled paper , as a standard . As relative values only were ...
Pagina 141
... luminosity and pressure in the case of pure hydrogen . The luminosity is also a function . of the current strength , which in these ... Luminosity Luminosity Pressure На Pressure Compound На Compound 0.7 IMPURITIES IN GASEOUS SPECTRA 141.
... luminosity and pressure in the case of pure hydrogen . The luminosity is also a function . of the current strength , which in these ... Luminosity Luminosity Pressure На Pressure Compound На Compound 0.7 IMPURITIES IN GASEOUS SPECTRA 141.
Pagina 142
I. Luminosity Luminosity Pressure На Pressure Compound На Compound 0.7 33 4.5 -11.8 24 6.2 0.7 35 4.9 12.5 18 6.2 -0.8 33 4.0 15 17 4.5 I 44 4.5 15 16 4.5 1.4 65 8.8 -16 13 1.3 70 7.3 -23.5 4 2.8 -1.5 55 -28 3 2.5 Οι όρ 1.5 65 9.4 -27 3 ...
I. Luminosity Luminosity Pressure На Pressure Compound На Compound 0.7 33 4.5 -11.8 24 6.2 0.7 35 4.9 12.5 18 6.2 -0.8 33 4.0 15 17 4.5 I 44 4.5 15 16 4.5 1.4 65 8.8 -16 13 1.3 70 7.3 -23.5 4 2.8 -1.5 55 -28 3 2.5 Οι όρ 1.5 65 9.4 -27 3 ...
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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...
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