[Illustration]




SCIENTIFIC AMERICAN SUPPLEMENT NO. 601




NEW YORK, JULY 9, 1887

Scientific American Supplement. Vol. XXIV, No. 601.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.


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TABLE OF CONTENTS.

I. ASTRONOMY.--A Star Finder.--A simple apparatus that can be
constructed by any mechanic.--1 illustration.

Photographic Study of Stellar Spectra, Harvard College Observatory.
--First annual report of the Henry Draper memorial observations.