An elevator (North American English) or lift (Commonwealth English) 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 Clément Ader
“Eole” redirects here. For the racehorse, see Eole (horse) .The…
invented by Frédéric Swarts
Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) are fully or…
invented by Nicéphore Niépce
Nicéphore Niépce invents Heliography, the first photographic process.
invented by John J. Loud
A ballpoint pen, also known as a biro (British English), ball pen (Philippine…
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