Collins, A. Frederick (Archie Frederick), 1869- · New York, London, D. Appleton and company · leaf 210
Fig. 182.—Boy Looking throughPrism at Slit in Cardboard. 190 THE BOOK OF THE STARS When you look at the sunlight streaming in through the slitin the cardboard you will see a number of dark lines crossingthe colored band. These dark lines are called Fraunhofers lines,because Fraunhofer, who was a…
Astronomy · Stars
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