2001. shaduf. or Shaduf (both: shdf, sh df) (KEY) , primitive device used to lift water from a well or stream for irrigation purposes. Essentially the device consists of a long boom balanced across a horizontal support from 8 to 10 ft (2.4 3 m) above the ground. The beam has a long, thin end and a short, stubby end.
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If you want to tumble large stones, say 5-inches in diameter, multiply the rock size by 3.5 to get the rotary barrel size you will need. If you want really rounded rocks, rotary tumblers are the way to go. If angular (not sharp) rocks are okay, vibratory is the way to go. If noise will be an issue, rotary tumblers are very quiet.