Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 387
re at theends of the valve, and are connected through the hollow stem or body of thevalve. The valve depends on its accuracy of fit for its tightness. The valve-chamber is bored out and ground, the valve is turned, ground, and carefullyworked by hand, to so close a fit that there is no loss of…
Mechanical drawing
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