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Spectra Of Various Sources Of Light.
The Heavens Above: A Popular Handbook of Astronomy
It has been the aim of the authors to give inthis little book a brief, simple, and accurate accountof the heavens as they are known to astronomersof the present day. It is believed that there isnothing in the book beyond the comprehension ofreaders of ordinary intelligence, and that it containsall the information on the subject of astronomy thatis needful to a person of ordinary culture. Theauthors have carefully avoided dry and abstrusemathematical calculations, yet they have sought tomake clear the methods by which astronomers havegained their knowledge of the heavens. The variouskinds of telescopes and spectroscopes have beendescribed, and their use in the study of the heavenshas been fully explained.
The cuts with which the book is illustrated havebeen drawn from all available sources; and it is believedthat they excel in number, freshness, beauty,and accuracy those to be found in any similar work.The lithographic plates are, with a single exception,reductions of t