THE COMPOUND STEAM PUMP USES
steam expansively, hence economically. Simpler than any other. Only
two moving parts in cylinder. No levers, springs, tappets, or
reversing valves. Critical examination invited. Address E. & A. Betts,
Wilmington, Del.
* * * * *
25 Beautiful Cards, with name, 10 cents, post paid. MILLPORT PRINTING
CO., Millport, N.Y.
* * * * *
Scientific American, Volume XXXVI., No. 8, February 24, 1877 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 141 / 203 题