Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 328
d theyare not unlike theaverage first classpump, but with thisdifference. It hasonly one set of coredports, B, B. Thesupplemental ports,C, C, are drilled. The main valve,A, is a slide and ismoved by a valvepiston, D. Almost allthe valve pistons asnow made are simplyplugs turned accur-ately to fit…
Hydraulic machinery · Pumping machinery
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