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July 16, 1877
March 5, 1878
Country of Publication
Among the advantages attained by my invention may be mentioned the great economy of power by the utilization of the expansive force of the steam and adaption of the power to the load, the perfect control of the car by the duplex action of the governing mechanism, also the permanent locking of the car or platform in position at any reduction of the sustaining force below a given pressure.
Hydraulic elevator, elevators, hydraulic
Engineering | Mechanical Engineering
Morgan, Charles H., "Improvement in Hydraulic Elevators" (1878). WPI Patents Collection. 14.