On the Connexion of the Physical SciencesJ. Murray, 1858 - 523 pages |
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Page 162
... spectrum , Sir John Herschel has discovered a set of very dark red rays beyond the red extremity of the spectrum which can only be seen when the eye is defended from the glare of the other colours by a dark blue cobalt glass . He has ...
... spectrum , Sir John Herschel has discovered a set of very dark red rays beyond the red extremity of the spectrum which can only be seen when the eye is defended from the glare of the other colours by a dark blue cobalt glass . He has ...
Page 163
... spectrum which also maintain a fixed position . Among the dark lines , M. Fraunhofer selected seven of the most remarkable , and determined their distances so accurately , that they now form standard and invariable points of reference ...
... spectrum which also maintain a fixed position . Among the dark lines , M. Fraunhofer selected seven of the most remarkable , and determined their distances so accurately , that they now form standard and invariable points of reference ...
Page 164
... spectrum of a lamp , and generally of all white flames , none of the defective lines are found ; so all such flames contain rays which do not exist in the light of the sun or stars . Brilliant red lines appear in the spectrum pro- duced ...
... spectrum of a lamp , and generally of all white flames , none of the defective lines are found ; so all such flames contain rays which do not exist in the light of the sun or stars . Brilliant red lines appear in the spectrum pro- duced ...
Page 165
... extinguish one another , by their union , when accidental ; and also that the com- bination of all the tints of the solar spectrum produces white light if they be from a direct impression on the SECT . XIX . 165 ACHROMATIC TELESCOPE .
... extinguish one another , by their union , when accidental ; and also that the com- bination of all the tints of the solar spectrum produces white light if they be from a direct impression on the SECT . XIX . 165 ACHROMATIC TELESCOPE .
Page 169
... spectrum is equal to the 0.0000258th part of an inch ; consequently , when the elevations of the waves combine , they produce double the intensity of light that each would do singly ; and when half a wave combines with a whole —that is ...
... spectrum is equal to the 0.0000258th part of an inch ; consequently , when the elevations of the waves combine , they produce double the intensity of light that each would do singly ; and when half a wave combines with a whole —that is ...
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61 Cygni action appears atmosphere attraction bismuth bodies cause centre centrifugal force chemical colour comet consequently copper crystal dark degree density diamagnetic diameter diminishes direction disturbing double stars earth ecliptic effect electricity equal equator ethereal medium excentricity Fcap force glass gravitation greater heat hemisphere increase intensity Jupiter latitude length light lines liquid longitude luminous lunar magnetic major axis mass meridian metallic miles moon motion move nearly nebula nodal lines nodes northern hemisphere NOTE nutation observed optic axis orbit oscillations parallax paramagnetic particles passing perihelion periodic phenomena planets plate polarized pole position Post 8vo produced quantity rays reflected refraction refrangible revolution revolving right angles rings rotation round satellites Sir John Herschel solar spectrum space stars substances sun's surface telescope temperature terrestrial tion tourmaline transmitted tricity undulations Uranus vapour variation velocity vibrations Vols Voltaic waves wire Woodcuts