Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 400
is effected by a smallhole at a, which, when the valve is closed,is opened, and the water in the hydrant, ifany, is discharged. This vent is closed bya slide attached to the valve-rod, when thislast is moved down to open the main valve.Instead of leather for the valve-face, manyvalves are fitted…
Mechanical drawing
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