Pulley systems are used in the real world to lift large masses onto tall heights. I have seen the workers repairing the roof of a house and using the pulley system to lift their tools and materials to the roof.
The pulley system is made up of of one or more pulleys and a rope or a cable. The number of pulleys used may be more or less, so the easier it is to lift the object that is being lifted.
No matter how easy it is to use the pulley system, the system itself is not very easy to use because of the force of friction. For example, one has to pull two meters of rope of cable through the pulleys just to lift an object one metre.
Ancient Egyptian Pulley System
The ancient Egyptian wooden four lobe pinion pulley was used to construct the Giza Pyramids in around 2600 BC.
This pulley surrounds its load and works with a mechanical advantage of 2.8 (MA=2.8) on the lever principle. When hoisted, the pulley with load rotates and climbs stepped structures with engagements of pulley lobes with steps.
This is earliest machine known using "rack and pinion" mechanical technology.
Ezekiel's vision
Ezekiel’s vision is about some ideas about alien spacecraft and the planets motion of our solar system.
What great structures have been put up in the Middle East where thousands of workers were employed and who would return home and tell others what they saw?
Ezekiel’s writings started in Babylon around 590 BC and his descriptions are very specific in many instances. The “wheel within wheel” machines are “high and awesome having four rims with eyes all around.”
Ramps are not mentioned in any documents describing how the Giza Pyramid were made, so why ramp theories exist today is a bigger mystery than the Pyramid itself.
By Maia Brausch (with the help of Google)
1 comments:
Maia you are able to present your research very well. Next time try to take your notes using key words and phrases rather than copying fron sources directly. :)
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