Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 234
19 shows six positions of one of the old slide valves and piston, together withthe position of the crank and eccentric for each movement of the valve. MECHANICS. 217 In Fig. 419 the valve is merely suflficient to cover the ports, and at the slightestmovement in either direction passages veill be… … A- i
Mechanical drawing
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