CENTENNIAL AND PARIS MEDALS.

Mason's Friction Clutches and Elevators.

"New and Improved Patterns."

VOLNEY W. MASON & CO., Providence, R. I., U. S. A.

BROWN'S PAT. SPLIT PULLEYS

Shafts, Hangers,

At low prices. Largest assortment. A. & F.

BROWN, 57, 59, & 61 Lewis St., New York.

[Illustration: PROSPECTUS]

Scientific American, Vol. XLIII.—No. 1. [New Series.], July 3, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures · 第 150 / 157 题