Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 377
must be provided to give proper support to the rubbervalve, but too many are objectionable, as small ports would be liable toobstruction by refuse. d. The edges of the valve-seat ports must be moderatelyrounded over, to remove such sharp edges and points, as wouldbe liable to cut, or damage the…
Hydraulic machinery · Pumping machinery
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
