Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 377
¥v*. 9. Fig. 10. Steam Fire Pumps. 379 Other methods may be approved, in writing, if found by test and ex-perience to»have especial merit. b. These stems must be screwed into the seats on a straight,tightly fitting thread, and the lower end then well headed overinto a countersink. The valve guard…
Hydraulic machinery · Pumping machinery
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