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Telephone Attachment.
Patent for a telephone attachment for multi-party lines, which allows the user to hold the line against eavesdropping by other users on the line and let multiple people use the line at the same time.
Date:
November 23, 1909
Creator:
Mitchell, Charles B.
System:
The Portal to Texas History
Improvement in Bridges.
Patent for an improvement in Bridges and Self-Supporting Roofs and Girders. The invention provides instruction for "the construction of truss-bridges and self supporting roofs and girders"..."by nailing or bolting securely together successive layers of plank joined at different points."
Date:
May 26, 1873
Creator:
Davis, Benjamin F.
System:
The Portal to Texas History
Horseshoe.
Patent for improvements in horseshoes, which will have two parts that pivot together at the toe. Includes instructions and illustrations.
Date:
February 18, 1891
Creator:
Custer, George
System:
The Portal to Texas History
Improvement in Car-Couplings.
Patent for an improved automatic car-coupling, including illustrations.
Date:
November 23, 1875
Creator:
Harper, Derastus
System:
The Portal to Texas History
Cotton-Chopper.
Patent for a new "machine for chopping surplus cotton or corn out of the rows or drills, leaving it in hills at the desired distance apart" (lines 8-11) including instructions and illustrations.
Date:
March 23, 1886
Creator:
Farley, John C.
System:
The Portal to Texas History