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Ch. 14: Tunnels and Sluices

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TUNNELS AND SLUICES.                             223
stone riffles are used the bottom of the sluice is lined with rough plank.
The top sluice on one side is for carrying sipage water when the blocks are being set. It is 13 inches wide and 14 inches deep, and is made of 1-1/2-inch plank.
Bed-Rock Claim Sluice Boxes.—At the Bed-Rock Claim, Nevada County, the tunnel sluice boxes are 14 feet long, 5 feet wide, and 32 inches deep. The details of a box are as follows :
Ch. 14: Tunnels and Sluices Page of 331 Ch. 14: Tunnels and Sluices
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