Machinery and processes of the industrial arts, and apparatus of the exact sciences (1869)
Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Washington, Govt. print. off. · leaf 515
when the pump is employed to compress air, this32 i A 498 PARIS UNIVERSAL EXPOSITION. branch is open in its turn to the atmosphere. The valves as drawn inthe figure are operated by the elasticity of the air. But in the con-struction now given to this part of the apparatus, they are opened andshut… … Deleuils Free-piston Air-pump. movement as the piston changes its direction. This movement opens avalve at one end and simultaneously closes the corresponding one atthe opposite end; but this change having been effected, the rod remainsstationary, the piston sliding on it as it continues its…
Machinery · Scientific apparatus and instruments
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
