Rocker box
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Today, the rocker box is not used as extensively as the sluice, but still is an effective method of recovering gold in dryer than usual areas. Like a sluice box, the rocker box has riffles and a carpet in it to trap the gold. It was designed to be used in areas with less water than a sluice box. The process involves pouring water out of a small cup and then rocking the small sluice box like a cradle, thus the name rocker box or cradle.
A rocker box is also a motorcycle engine part.
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