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Daemon
Posted: Thursday, February 7, 2019 12:00:00 AM
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Simple Machines

Practically every machine in existence incorporates one or more simple machines, elementary mechanical devices that change the magnitude or the direction of a force. These include the lever, wheel and axle, pulley, inclined plane, wedge, and screw. The idea of the "simple machine" originated with the Greek philosopher Archimedes around the 3rd century BCE, but it was not until 1600 that scientists showed that simple machines only transform energy and do not create it. Who figured this out? More...
KSPavan
Posted: Thursday, February 7, 2019 12:18:04 AM

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Simple Machines
Practically every machine in existence incorporates one or more simple machines, elementary mechanical devices that change the magnitude or the direction of a force. These include the lever, wheel and axle, pulley, inclined plane, wedge, and screw. The idea of the "simple machine" originated with the Greek philosopher Archimedes around the 3rd century BCE, but it was not until 1600 that scientists showed that simple machines only transform energy and do not create it.
taurine
Posted: Thursday, February 7, 2019 6:10:19 AM

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Polybius, writing on the Roman siege of Syracuse (Sicily), stated: "a single soul can be more effective in some instances than a whole multitude of hands". The city of Syracuse was alone while facing many Romans.
The word Ἀνυστικωτέρα was used by Polybius to describe: very productive.
Another word used by Polybius while referring to Archimedes, was Ἐμβελές meaning "within missile-range".
According to Polybius, Archimedes prepared machines for every distance within missile-range, so "damaging from afar those who were sailing in with the more powerful and large stone-throwers and catapults; and when these shot too high, with the smaller ones".

Sas? Nic. Sassnitz. Rug, ja? Rugen. Telemark in Harzgerode.
taurine
Posted: Thursday, February 7, 2019 6:42:16 AM

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As to Heron of Alexandria, he described something remarkable.
Heron of Alexandria gave account of an instrument that was intended to determine lengths from distance and extensively used on aqueduct building projects and by astronomers. He cited words used by undisclosed writer: "you will see these things in advance with your dioptra". The dioptra was described as a mechanical implement with which the geometers used to asses with precision the measure of battlements from a distance.

Word used by Heron of Alexandria to describe it was Διοπτῆρα meaning scout, spy, inspector



Sas? Nic. Sassnitz. Rug, ja? Rugen. Telemark in Harzgerode.
JustKen
Posted: Thursday, February 7, 2019 7:32:32 AM
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The wedge and screw are both examples of inclined planes. The pulley is an example of a wheel. Thus, in my opinion, there are just three simple machines: lever, wheel, inclined plane.
taurine
Posted: Thursday, February 7, 2019 8:33:10 AM

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JustKen wrote:
The wedge and screw are both examples of inclined planes. The pulley is an example of a wheel. Thus, in my opinion, there are just three simple machines: lever, wheel, inclined plane.


Hi there,
interesting observation.

Sas? Nic. Sassnitz. Rug, ja? Rugen. Telemark in Harzgerode.
Wilmar (USA)
Posted: Thursday, February 7, 2019 8:47:30 AM

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Practically every machine in existence incorporates one or more simple machines, elementary mechanical devices that change the magnitude or the direction of a force. These include the lever, wheel and axle, pulley, inclined plane, wedge, and screw. The idea of the "simple machine" originated with the Greek philosopher Archimedes around the 3rd century BCE, but it was not until 1600 that scientists showed that simple machines only transform energy and do not create it.
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