2 Matching Results

Willis Library will be without power on Tuesday, August 20, 2019 from 5:00-7:00 AM CDT. All websites and web services will be down during this period.

Search Results


Description: 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.
Partner: UNT Libraries Government Documents Department

Compensating Pump-Spring.

Description: 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.
Partner: UNT Libraries Government Documents Department