rocking cradle
Written by Administrator   
Monday, 29 October 2007

rocking cradle. A portable, hand op­erated, sluice and sieve box used by prospectors in separating alluvial materials. Usually, one or two sieves are mounted on two rocker arms, which are agitated by oscillation in water or air. diamond-bearing mate­rials are placed on the screen; fine material is sieved through, collected and washed. The coarse gravels are collected at the top and discarded.