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Did egyptians use cogs?

 
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Jonathan
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PostPosted: Tue Jul 19, 2005 1:36 pm    Post subject: Did egyptians use cogs? Reply with quote

Hi all im just wondering did egyptians ever use cog based systems from chores such as in conjunction with pulleys? strange question i know but ive always been curious about it
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anneke
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PostPosted: Tue Jul 19, 2005 3:24 pm    Post subject: Reply with quote

I don't know what "cogs" are, so I have no idea Smile
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dzama923
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PostPosted: Thu Mar 16, 2017 3:12 pm    Post subject: Reply with quote

Cogs are what clocks are made out of. They are gears. They are used in various machines, like waterwheels, and mills. They are circular with pegs, indentations, or ridges that move together with other wheels. They have been used in simple machinery for millennia, and is used today in complex machines.
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neseret
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PostPosted: Thu Mar 16, 2017 6:16 pm    Post subject: Reply with quote

dzama923 wrote:
Cogs are what clocks are made out of. They are gears. They are used in various machines, like waterwheels, and mills. They are circular with pegs, indentations, or ridges that move together with other wheels. They have been used in simple machinery for millennia, and is used today in complex machines.


The simple answer is 'no,' they did not use cogs.

They were aware of water-based pulley systems such as shadufs.

A shaduf is constructed of a long pole mounted on a seesaw, with a bucket, skin or other container attached at the end. A person pulls down on a rope to submerge the container into a source of water and then the container is raised up for emptying

The water may be gathered for household use or emptied into a channel that transports the water to fields or to settlements. The use of shadufs are critical for irrigation for many poorer societies, or for areas where power is not easily installed to power pumps and generators.

Originally developed in ancient Egypt, shadufs are still in use today in many parts of the world. The counterweight is constructed to be approximately half the weight of a full bucket or skin of water so that the effort to raise or lower the bucket is the same in either direction.

Harvested water from shadufs is not always used immediately, and can be stored for later use in cisterns, reservoirs, tanks and wells. Often these holding areas are lined and covered to prevent water loss and contamination.

See a shaduf in action: The Shaduf 1940-1949

HTH.
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