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Electric Meter.
Patent for a simple and inexpensive electric meter that measures and records "the time during which an electric translating device, such as a motor or light, is connected with the source of supply, such as a dynamo-electric machine, located at a central station" (lines 11-15). Anyone can understand how it works, and it is more accurate than other meters.
Date:
January 7, 1896
Creator:
McGrath, William H. & Oram, John M.
System:
The Portal to Texas History