Search results
Results from the WOW.Com Content Network
The screw pump is the oldest positive displacement pump. [1] The first records of a water screw, or screw pump, date back to Hellenistic Egypt before the 3rd century BC. [1] [3] The Egyptian screw, used to lift water from the Nile, was composed of tubes wound round a cylinder; as the entire unit rotates, water is lifted within the spiral tube to the higher elevation.
Water wheel used for irrigation in Nubia, painted by David Roberts in 1838. Paddle-driven water-lifting wheels had appeared in ancient Egypt by the 4th century BCE. [25] According to John Peter Oleson, both the compartmented wheel and the hydraulic noria appeared in Egypt by the 4th century BCE, with the saqiya being invented there a century later.
[105] [106] This is seen as an evolution of the paddle-driven water-lifting wheels that had been known in Egypt a century earlier. [105] According to John Peter Oleson , both the compartmented wheel and the hydraulic noria may have been invented in Egypt by the 4th century BC, with the Sakia being invented there a century later.
The first records of a water screw, or screw pump, dates back to Ancient Egypt before the 3rd century BC. [1] [2] The Egyptian screw, used to lift water from the Nile, was composed of tubes wound round a cylinder; as the entire unit rotates, water is lifted within the spiral tube to the higher elevation. A later screw pump design from Egypt had ...
Now, Dutch researchers say they've found a much simpler technique to make the job easier: just add water. Yep, how the builders transported stones weighing several tons from quarries all over the ...
The device then appeared in ancient Egypt from about 200 B.C., featuring a pair of gear-wheels [dubious – discuss]. [2] A version of the chain pump was used in ancient Greece and Rome, sometimes with pots, or scoops fixed to the chain, which, as they passed over the top pulley, tipped the water out; a 2nd-century example is preserved in ...
The first type of crane machine was the shadouf, which had a lever mechanism and was used to lift water for irrigation. [3] [4] [5] It was invented in Mesopotamia (modern Iraq) circa 3000 BC. [3] [4] The shadouf subsequently appeared in ancient Egyptian technology circa 2000 BC. [5] [6]
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!