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A simple machine is a mechanical device that changes the direction or magnitude of a force. [1] In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. [2] Usually the term refers to the six classical simple machines that were defined by Renaissance scientists: [3] [4 ...
Basic diagram of an onager, a type of catapult. A catapult is a ballistic device used to launch a projectile a great distance without the aid of gunpowder or other propellants – particularly various types of ancient and medieval siege engines. [1] A catapult uses the sudden release of stored potential energy to propel its payload.
Historians such as Livy attributed heavy Roman losses to these machines, together with catapults also devised by Archimedes. The plausibility of this invention was tested in 1999 in the BBC series Secrets of the Ancients and again in early 2005 in the Discovery Channel series Superweapons of the Ancient World .
Mighty Machines is a Canadian educational children's television series that teaches about machines and how they work and the jobs they do. The show premiered in October 1994 on Family Channel . The show aired 39 episodes over three seasons until 2008.
This is an accepted version of this page This is the latest accepted revision, reviewed on 6 January 2025. Siege engine using long arm to throw projectiles For other uses, see Trebuchet (disambiguation). Replica counterweight trebuchets at Château de Castelnaud Counterweight trebuchet used in a siege from the Jami' al-tawarikh, c. 1306-18 A trebuchet [nb 1] is a type of catapult that uses a ...
Inventions that are credited to the ancient Greeks include the gear, screw, rotary mills, bronze casting techniques, water clock, water organ, the torsion catapult, the use of steam to operate some experimental machines and toys, and a chart to find prime numbers. Many of these inventions occurred late in the Greek period, often inspired by the ...
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In 1894, Hargrave linked four of his kites together, added a sling seat, and flew 16 feet (4.9 m). By demonstrating to a sceptical public that it was possible to build a safe and stable flying machine, Hargrave opened the door to other inventors and pioneers. Hargrave devoted most of his life to constructing a machine that would fly.
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