WORKING MODELS
And Experimental Machinery, Metal or Wood, made to order by
J. F. WERNER, 62 Center St., N. Y.
[Illustration: Patents]
Scientific American, Vol. XXXVII.—No. 2. [New Series.], July 14, 1877 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures · 第 175 / 213 题