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 Isaac Charles Johnson
Portland cement is the most common type of cement in general use around the…
invented by James Beaumont Neilson
Hot blast refers to the preheating of air blown into a blast furnace or other…
invented by James Clerk Maxwell
Color photography is photography that uses media capable of capturing and…
invented by Hanaoka Seishu
General anaesthetics (or anesthetics, see spelling differences) are often…
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