Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 162
spectroscopesthe flat beam is trans-mitted through a suc-cession of prisms, eachof which aids in its dis-persion. The mannerof increasing the power Of a SpectrOSCOPe is Fig 69 Method of increasing the dispersion, . V Cn of light. shown in rig. 69. Principles of Spectrum Analysis. 123. The… … 158 ASTRONOMY. gaseous state and under low pressure is discontin-uous, being made up of bright lines ; the order andthe number of bright lines is characteristic, that is,it is always the same for the same substance. 3°. *A- substance in a gaseous state absorbs fromwhite light, when transmitted…
Astronomy
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