i 
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196 NEW TRACKS IN NORTH AMERICA. | 
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into the sluice to be washed, thus saving the expense off) 
shovelling. 
It was long before this process made much way in Cali- i 
fornia ; but at present it is in general use, and pays largely), 
Its ssiveninbes are enormous. A man with a rocker, folll F 
instance, can wash out one cubic yard of earth in a day; witli i 
eee 
Hydraulic Mining. 
and sluice together, fifty, or even a hundred. A stream off, 
water rushing through a two-inch pipe, under pressure of 200) 
feet perpendicular, has tremendous force, and the hill-sides 
crumble away before it as if they were made of srisesiana F 
y 
\ 
. ° t 
a tom, two; with a sluice, four; and, with an hydraulic squirt i 
r 
i 
