SCIENTIFIC AMERICAN

A WEEKLY JOURNAL OF PRACTICAL INFORMATION, ART, SCIENCE, MECHANICS, CHEMISTRY, AND MANUFACTURES.

NEW YORK, MARCH 18, 1871.

Vol. XXIV.—No. 12. [NEW SERIES.]

$3 per Annum [IN ADVANCE.]

MUNN & CO., Editors and Proprietors.

PUBLISHED WEEKLY AT
NO. 37 PARK ROW (PARK BUILDING), NEW YORK.

O. D. MUNN. S. H. WALES. A. E. BEACH.

VOL. XXIV., NO. 12 ... [New Series.] Twenty-sixth Year