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