SCIENTIFIC AMERICAN
A WEEKLY JOURNAL OF PRACTICAL INFORMATION, ART, SCIENCE,MECHANICS, CHEMISTRY, AND MANUFACTURES.
NEW YORK, MARCH 29, 1879.
Vol. XL., No. 13. [New Series.]
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Scientific American.
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VOL. XL., No. 13. [New Series.] Thirty-fourth Year.
NEW YORK, SATURDAY, MARCH 29, 1879.
Contents.
(Illustrated articles are marked