Inside Out Library
The spectroscope and its work (1910)
Newall, H. F · London : Society for Promoting Christian Knowledge · leaf 182
o< ^ a ■3 - > o 5 5 > rr, J … go r ^ c2 pq § 2 ps Plate VIII.Spectroscope · Spectrum analysis
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
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