Greek scientist who invented the double pulley

Historians, however, credit Greek mathematician, inventor, astronomer, engineer and physicist, Archimedes , with the first documented compound pulley system in the third century BCE.

He used a system of compound pulleys to move a three-mated merchant vessel with passengers aboard to dry land, according to a written work by Greek biographer and essayist, Plutarch.

Essentially, Archimedes improved on the invention of the single pulley by proving his theory that a pulley operates much like a lever. Both devices reduce the amount of effort the operator needs to exert to move an object.

Showing that several pulley wheels dispersed the weight more than a single pulley, he proved the formula mechanical advantage MA. MA is the number of rope sections that determines how much easier it is to lift or haul the object. This device consisted of huge beams that swung out.

One version dropped weights to punch holes through invading ships to sink them. Another made use of a claw to raise, shake or capsize a ship. Other early applications of pulleys in ancient warfare were crossbows and catapults among others. Though the robot did not survive to the present day, it appears that the device was capable of walking, sitting, and jaw movement through a system of pulleys and gears.

He also incorporated some of the concepts in the design of planetary exploration robots for NASA. Through the years, pulleys found their way to the dark side of history. Warfare and torture devices became all the more gruesome with the mechanisms involved.

One such device is the strappado, mostly used to extract information from alleged heretics and witches. This device consisted of a pulley over a rope that passed over a beam or hook on the roof and was tied to the hands of the victim.

Additional weight could be added to the feet. The strappado dislocated joints and limbs causing long-term damage to nerves and muscles, and permanent paralysis and loss of sensation in the arms. Another torture device was the upright jerker. A cord was wrapped around the neck of the condemned who was positioned on a platform. Rather than dropping through a trap door, a system of weights and pulleys would jerk the victim into the air violently.

Today, pulleys have a variety of configurations. A class 1, or fixed pulley , is stationary. It redirects the force in the rope or cable. A single anchored pulley has the mechanical advantage of one. In contrast, a class 2, or movable pulley, has a free axel with a mechanical advantage of two, meaning if one end of the rope is anchored, an operator pulling on the other end of the rope will have double the lift force on the object attached to it. A compound pulley combines fixed and moveable components.

Block and tackle pulleys use a single continuous rope to disperse tension force around one or more pulleys to lift or move an object. It is interesting to consider how pulleys have transformed everyday life. For example, there are , elevators in the U. That is one elevator for every people. The average ride on an elevator is 40 feet floors , and the average number of elevator trips by U.

In terms of distance traveled, that translates to million miles per year or about rounds to the moon! Without pulley-enabled elevators, high-rise buildings would be impractical, of course.

He also discovered the when an object is place in fluid, the volume of the fluid that is displaced is equal to the volume of the object. The Greek scientist who discovered the principle lever and invented the double pulley and a catapult was known as Archimedes.

He was a very talented ancient Greek scientist. Who invented the rocket Catapult. Carbon is a natural element. There is no scientist that invented Carbon. Carbon was discovered in prehistoric times. The catapult was invented in the Middle Age. Electromagnetic wave were discovered not invented. Gutenberg invented the printing press not the catapult. Television was invented not discovered. Alfred Nobel invented dynamite.

It was invented by Louis Pasteur, who lived in France. The computer wasn't discovered, it was invented. Charles Babbage is generally credited with inventing the first mechanical computer. He didn't invent the catapult it was dionysius and he invented it in B. The catapult was first used by the army of the Roman Empire. History does not record the name of the Roman engineer who first invented it. It is unknown who invented the Medieval catapult. It was an effective weapon that could break down the doors and walls of fortresses and castles.

The word catapult came from ancient greece. It was also invented there. It means from two seperate words kata pultos. Faraday was a scientist that invented the electric motor. He also discovered the first direct current generator and the first transformer. As far as we know the first catapult was built and invented by the ancient greeks. Most people think it was the Greeks, but actually it was centuries before them that the catapult and the rapid fire arrow machines were invented by King Uzziah.

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Causes of fires. Q: Greek scientist who discovered the principal of the lever and invented the double pulley and a catapult?