Audiphone (open access)

Audiphone

Patent for a audiophone which reproduces sounds at their original volume and timbre through the use of diaphragms vibrated by an electric signal.
Date: October 15, 1907
Creator: Baker, John A.
Object Type: Patent
System: The Portal to Texas History
Brick Kiln (open access)

Brick Kiln

Patent for a brick kiln. Illustration included.
Date: November 15, 1904
Creator: Sonka, Joesph & Metzner, Robert A.
Object Type: Patent
System: The Portal to Texas History
Automatic Cylindrical Power. (open access)

Automatic Cylindrical Power.

Patent for a new and improved cylindrical power-source. This design "consists in the combination of a cylindrical slotted frame with a series of blades which are connected together in pairs, and which are alternately forced through the slots in the frame to receive the force of the wind or water and then retracted, so that they will offer no resistance during a portion of the revolution of the frame. . . . The object of [the] invention is to produce a motor which is adapted for use either as a wind-wheel or a water-wheel" (lines 13-27).
Date: November 15, 1881
Creator: Hutchinson, Thomas E.
Object Type: Patent
System: The Portal to Texas History
80th Texas Legislature, Regular Session, Senate Bill 747, Chapter 1405 (open access)

80th Texas Legislature, Regular Session, Senate Bill 747, Chapter 1405

Bill introduced by the Texas Senate relating to the authority of the Barton Springs-Edwards Aquifer Conservation District to charge certain fees and limit groundwater production during a drought.
Date: June 15, 2007
Creator: Texas. Legislature. Senate.
Object Type: Legislative Document
System: The Portal to Texas History
Crank-Axle Adjustment. (open access)

Crank-Axle Adjustment.

Patent for a crank axle adjustment "to simplify and produce and efficient crank axle that will efficiently perform its function in connection with the general structure of a plow or cultivator." (lines 13-17)
Date: June 15, 1920
Creator: Kopplin, Otto E.
Object Type: Patent
System: The Portal to Texas History
Plow. (open access)

Plow.

Patent for an improvement to the plow by adjusting various devices for better results.
Date: April 15, 1919
Creator: Kopplin, Otto E.
Object Type: Patent
System: The Portal to Texas History