Shake-a-Sieve MkI

MkI used the sieve running on rails made of coat-hanger wire ( quite a handy material) with no casters. Just a bit of silicon grease. It rested on a wheel barrow. There are two kinds of behaviour when the machine operates: when empty the sieve moves well, but when full its mass exceeds that of the frame and saw so the sieve tends to stay still and the frame moves! (action and reaction). MkI threw itself to the ground quite dramatically. MkII has a substantial timber frame, rests on the remains of an old folding travel cot, and the carriage is on casters. There is still a lot of reaction but the motion of the entire assembly contributes to the sieving action.

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