Bulletin of the Philosophical Society of Washington, Volume 15

aërial Allegheny observatory American anomalous dispersion astronomical atmosphere black body black radiation bolometer celestial mechanics century chromosphere cloud computation conclusion continued coöperation Cottage City Darwin's paper deformation density earth earth's atmosphere earthquakes eclipse Eimbeck elastic limit emitted Ephemeris evidence experiments fact failing structure failure field Fraunhofer lines gaseous gases harmonic heat idea important Institution instruments interest investigation isostasy Kirchhoff's knowledge Langley light lines load magnetic material mathematical mechanics memoir ment meteorology methods mind motion nature Nautical Almanac Office observations observatory ocean Octave phenomena Phil PHILOSOPHICAL SOCIETY physical physicist practical present President pressure problems Professor Newcomb progress publication published rays regions SAMUEL PIERPONT LANGLEY scale scientific Simon Newcomb Smithsonian SOCIETY OF WASHINGTON solar spectrum STEFAN-BOLTZMANN law stress-difference stresses sun's surface temperature theory thermodynamics tion tons per square University vapor vibrations Wash waterspout yielding