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Locking System For Jail-Doors.

Description: Patent for a new locking system for jail-doors with a unique arrangement of parts, including specifications and illustrations.
Date: May 5, 1914
Creator: Youngblood, David Franklin
Partner: UNT Libraries Government Documents Department

Propeller for Boats.

Description: Patent for improvements in propellers for boats by “having a pair of hinged propeller-blades adapted to swing toward and away from each other, combined with fixed prongs; which are engaged with the propeller blades and hold them from displacement.” (Lines 60-65) Illustration is included.
Date: May 5, 1891
Creator: Gillespie, Lewis
Partner: UNT Libraries Government Documents Department

Measuring and Proportioning Machine.

Description: Patent for "a device by which the mixing of various ingredients in certain desired proportions may be easily and accurately accomplished" (lines 8-11). It is meant for industrial measuring.
Date: May 5, 1896
Creator: Collins, Alonzo G.
Partner: UNT Libraries Government Documents Department

Touch-Regulator for Pianos

Description: Patent for a touch regulator for pianos.
Date: May 5, 1903
Creator: Goggan, Michael
Partner: UNT Libraries Government Documents Department
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