Patent Model - Improvement in Steam-Pumps

Maker and role
David Douds (b.1830, d.1894), Patentee
John Hartsuff (b.1823, d.1895), Patentee
David Douds (b.1830, d.1894), Assignor
John Hartsuff (b.1823, d.1895), Assignor
Perry Douds (b.1837, d.1904), Assignee
Production date
Mar 03 1874
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Object detail

Cast iron, brass
11 3/8 x 10 3/8 x 10 1/2" (28.9 x 26.4 x 26.7cm)
Douds and Hartsuff's invention "relates to that class of steam-pumps in which the steam is caused to act by direct pressure upon the water, and is directed alternately upon two chambers, having a common steam and delivery pipe controlled by tilting valves in such a manner as to direct the steam alternately upon each chamber, one being filled with water while the other is being emptied." (Patent Number 148,041)
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