History of Astronomy |
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Page 90
... spectra ; gases , except under enormous pressure , give bright lines . If sodium or common salt be thrown on the colourless flame of a spirit lamp , it gives it a yellow colour , and its spectrum is a bright yellow line agreeing in ...
... spectra ; gases , except under enormous pressure , give bright lines . If sodium or common salt be thrown on the colourless flame of a spirit lamp , it gives it a yellow colour , and its spectrum is a bright yellow line agreeing in ...
Page 91
... spectra had long been known , by transmission through , or reflection from , a 1 The experiment had been made before by one who did not understand its meaning . But Sir George G. Stokes had already given verbally the true explanation of ...
... spectra had long been known , by transmission through , or reflection from , a 1 The experiment had been made before by one who did not understand its meaning . But Sir George G. Stokes had already given verbally the true explanation of ...
Page 92
... spectra of the sun's East ( approaching ) limb and West ( receding ) limb , and the displacement of lines endorsed the theory . last observation was suggested by Zöllner . This 1 Abh . d . Kön . Böhm . d . Wiss . , Bd . ii . , 1841-42 ...
... spectra of the sun's East ( approaching ) limb and West ( receding ) limb , and the displacement of lines endorsed the theory . last observation was suggested by Zöllner . This 1 Abh . d . Kön . Böhm . d . Wiss . , Bd . ii . , 1841-42 ...
Page 102
... . But Rowland , of Baltimore , after having perfected the art of making true gratings with equidistant lines . ruled on metal for producing spectra , then proceeded to make a map of the solar spectrum on a 102 THE PHYSICAL PERIOD.
... . But Rowland , of Baltimore , after having perfected the art of making true gratings with equidistant lines . ruled on metal for producing spectra , then proceeded to make a map of the solar spectrum on a 102 THE PHYSICAL PERIOD.
Page 118
... spectra agreeing together . Sometimes Uranus shows Frauenhofer lines , indicating reflected solar light . But generally these are not seen , and six broad bands of absorption appear . One is the F. of hydrogen ; another is the red ...
... spectra agreeing together . Sometimes Uranus shows Frauenhofer lines , indicating reflected solar light . But generally these are not seen , and six broad bands of absorption appear . One is the F. of hydrogen ; another is the red ...
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accepted accurate ancient appear astronomers attraction bodies bright calculations called catalogue cause centre century Chinese circle comet compared complete Copernicus determined diameter direction discovered discovery distance earth eclipse effect elements enabled epicycles equal error explain fact fixed follow force four Galileo gave give given gravitation heavens held Herschel increased interesting Jupiter Kepler knowledge known later LIBRARIES light lunar Mars mass mathematical mean measured method miles moon moon's motion move Newton noticed object observations Observatory opposition orbit original parallax pass period photographic physical planet planetary pole position predicted progress proper motion proved records researches revolve ring rotation round Royal satellites seems seen showed SIGILLUM solar system spectroscope spectrum stars studied sun's supposed surface tables telescope theory tion trace true Tycho Brahe UNIVERSITY VERITAS