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EBOOK SCIENTIFIC AMERICAN, SUPP. 601 ***
Produced by by Jon Niehof, Don Kretz, Juliet Sutherland, Charles Franks
and the DP Team
[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.
* * * * *
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.
--Review of the work by Prof. EDWARD C. PICKERING.
II. BIOLOGY.--Sponges.--The growth and life history of sponges.--Report
of a recent lecture at the London Royal Institution by Dr.
R. VON LEDENFELD.
III. ELECTRICITY.--Phenomena of Alternating Currents.--By Prof.
ELIHU THOMSON.--16 illustrations.
IV. ENGINEERING.
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