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