Index of Spectra: With an Introduction on the Methods of Measuring and Mapping Spectra (Classic Reprint) - Softcover

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Excerpt from Index of Spectra<br/><br/>A number within parentheses, thus: (8091 means that while a line in this position has been observed. No new measurement of wave-length was made  the wave length being quoted from another observer. The intensities of the lines are expressed upon an ascending scale from 1 to 10 1 being the feeblest and 10 the brightest.

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