The hydraulic crane was invented by Sir William Armstrong in 1846, principally to be used with the Tyneside docks for loading cargo. They speedily supplanted the sooner steam-pushed elevators, exploiting Pascal's law to supply much better power. In 1920, Howard B. Cook introduced a paper titled "Passenger Elevator Support".[37] This https://oswaldn307vbf9.blogscribble.com/profile