National Museum of American History
Balance
Ehrhardt, J. H. · 1866
Patent model for Johann Heinrich Ehrhardt, “Improvement in Machines for Determining the Load of Car-Axles,” U.S. Patent 52,653 (Feb. 13, 1866). A brass tag on the frame reads “H. Ehrhardt / Dresden.” Ehrhardt's platform scale was designed to balance the load of locomotives and other railroad cars, so as to equalize the pressure on each of the wheels.
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