An elevator (North American English)[1] or lift (Commonwealth English)[2] is a type of cable-assisted, hydraulic cylinder-assisted, or roller-track assisted machine that vertically transports people or freight between floors, levels, or decks of a building, vessel, or other structure. They are typically powered by electric motors that drive traction cables and counterweight systems such as a hoist, although some pump hydraulic fluid to raise a cylindrical piston like a jack.
invented by Samuel Morse
Morse code is a method used in telecommunication to encode text characters as…
invented by Abraham Louis Breguet
A watch is a portable timepiece intended to be carried or worn by a person. It…
invented by Joseph Henry
A relay is an electrically operated switch. It consists of a set of input…
invented by
An internal combustion engine (ICE or IC engine) is a heat engine in which the…
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