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Pascal's law applies only for fluids. Pascal's principle is defined as A change in pressure at any point in an enclosed fluid at rest is transmitted undiminished to all points in the fluid.
The hydraulic elevator is supported by a heavy piston, moving in a cylinder and is operated by the water (or oil) pressure produced by pumps. Elisha Otis. In 1853, American inventor Elisha Otis demonstrated a freight elevator equipped with a safety device to prevent falling in case a supporting cable broke.