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Electric motor.
Patent for improved electric motor used in motor vehicles "which may be associated directly with the driving-wheel of a motor-vehicle" (lines 40-41), bypassing the need for other power-transmitting mechanisms. Includes instructions and illustrations.
Date:
July 20, 1897
Creator:
Perret, Frank A.
Object Type:
Patent
System:
The Portal to Texas History
Gypsum Products: Their Preparation and Uses
Technical report issued by the Bureau of Mines over the different uses of gypsum. The sources and uses of gypsum are presented and discussed. This report includes tables, photographs, and illustrations.
Date:
July 1917
Creator:
Stone, Ralph W.
Object Type:
Report
System:
The UNT Digital Library
Propeller
Patent for a boat propeller that does not create a vacuum behind it and is more efficient than other propellers.
Date:
July 23, 1912
Creator:
Blake, David H.
Object Type:
Patent
System:
The Portal to Texas History
Engraving-machine.
Patent for improvements to an engraving machine. Illustrations included.
Date:
July 1, 1902
Creator:
Crane, Walter E.
Object Type:
Patent
System:
The Portal to Texas History