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in creator/contributor: "Ball, Thomas"

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 alteri… more

Date: April 11, 1893

Creator: Black, William L.

Item Type: Patent

Partner: UNT Libraries Government Documents Department

Automatic Danger-Signal for Railroads.

Patent for a "device for indicating at railroad crossings and other points, the approach or departure of trains within any given distance of such crossing or with relation to any point where persons might come into dangerous proximity to the train if they were left unadvised by some such signal as this." (Lines 19-26) Includes instructions and illustrations.

Date: February 26, 1895

Creator: Lee, Horatio Grooms; White, John P.; Ball, Thomas & White, James L.