Communications to the National Academy of Sciences, Issues 1-50

1918 - Astronomy

Contents

• THE RELATIONS BETWEEN THE PROPER MOTIONS AND THE RADIAL VELOCITIES: 1
• CRITIQUE OF THE HYPOTHESIS OF ANOMALOUS DISPERSION IN CERTAIN SOLAR: 9
• AN ATTEMPT TO MEASURE THE FREE ELECTRICITY IN THE SUNS ATMOSPHERE: 15
• RESULTS OF AN INVESTIGATION OF THE FLASH SPECTRUM WITHOUT AN ECLIPSE: 21
• PHOTOGRAPHIC DETERMINATION OF STELLAR PARALLAXES WITH THE 60INCH: 31
• ABSOLUTE SCALES OF PHOTOGRAPHIC AND PHOTOVISUAL MAGNITUDE: 39
• UNSYMMETRICAL LINES IN TUBEARC AND SPARK SPECTRA AS AN EVIDENCE OF: 47
• SOME VORTEX EXPERIMENTS BEARING ON THE NATURE OF SUNSPOTS AND FLOCCULI: 55
• NOVA GEMINORUM NO 2 AS A WOLFRAYET STAR: 61
• THE LIGHT Curve of XX CYGNI AS A CONTRIBUTION TO THE STUDY OF CEPHEID: 69
• A NOTATION FOR USE IN THE DISCUSSION OF Star Colors Frederick H Seares: 77
• STUDIES OF MAGNITUDES IN STAR CLUSTERS I ON THE ABSORPTION OF LIGHT: 85
• THE MINUTE STRUCTURE OF THE SOLAR ATMOSPHERE: 93
• A SHORT PERIOD CEPHEID WITH VARIABLE SPECTRUM Harlow Shapley: 101
• INVESTIGATIONS IN STELLAR SPECTROSCOPY I A QUANTITATIVE METHOD: 113
• INVESTIGATIONS IN STELLAR SPECTROSCOPY III APPLICATION OF A SPECTROSCOPIC: 124
• THE SITUATION IN REGARD TO ROWLANDS PRELIMINARY TABLE of Solar SPECTRUM: 139
• ON THE Suggested MUTUAL REPULSION OF FRA UNHOFER LINES: 149
• THE ROTATION AND RADIAL VELOCITY OF THE SPIRAL NEBULA N G C 4594: 157
• STUDIES Of Magnitudes IN STAR CLUSTERS III THE COLORS OF The Brighter: 169
• STUDIES OF THE MAGNITUDES IN STAR CLUSTER IV ON THE COLOR OF STARS: 183
• THE COLOR OF THE STANDARD POLAR STARS DETERMINED BY THE METHOD: 189
• THE PARALLAX OF THE PLANETARY NEBULA N G C 7662: 199
• PHOTOGRAPHIC MAGNITUDES OF STARS IN THE SELECTED AREAS OF KAPTEYN: 207
• Harlow Shapley: 217
• A SEARCH FOR AN EINSTEIN RELATIVITYGRAVITATIONAL EFFECT IN THE: 225
• THE DEVELOPMENT OF A Source for STANDARD WAVELENGTHS AND THE IMPOR: 235
• THE LOCATION OF THE SUNS MAGNETIC AXIS: 245

Bibliographic information

• Title: Communications to the National Academy of Sciences, Issues 1-50; Communications to the National Academy of Sciences, Mount Wilson Observatory
• Contributor: Mount Wilson Observatory
• Published: 1918
• Original from: the New York Public Library
• Digitized: Oct 9, 2008