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Compensating Pump-Spring.
Patent for an improvement on the inventor's previous patent (No. 450,657). The improvements include getting rid of the sleeve, and "employ[ing] volute springs instead of the straight flat springs formerly used; [the inventor] also dispense[s] with the links and connect the inner ends of the springs to long pitmen which have a pivotal connection with the suction rod at a point above the springs; [the inventor] furthermore provide[s] a means for adjusting the tension of the springs without altering the connection of the same with the suction rod" (lines 23-31).
Date:
April 11, 1893
Creator:
Black, William L.
System:
The Portal to Texas History
Safety-Clamp.
Patent for safety clamp "designed with special reference to supporting well-tubing in place in shallow or deep wells" (lines 8-10).
Date:
November 11, 1902
Creator:
Treadwell, Cornelia E.
System:
The Portal to Texas History