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POWER FOR MILLS

"As the Pelton wheel seems to find the most frequent application in California, it may be convenient for millmen to have the following rule, applicable to these wheels:

"When the head of water is known in feet, multiply it by 0.0024147, and the product is the horse-power obtainable from one miner's inch of water.

"The power necessary for different mill parts is:

For each 850lb. stamp, dropping 6 in. 95 times per minute, 1.33 h.-p.
For each 750lb. stamp, dropping 6 in. 95 times per minute, 1.18 h.-p.
For each 650lb. stamp, dropping 6 in. 95 times per minute, 1.00 h.-p.
For an 8-inch by 10-inch Blake pattern rock-breaker 9.00 h.-p.
For a Frue or Triumph vanner, with 220 revolutions per min. 0.50 h.-p.
For a 4-feet clean-up pan, making 30 revolutions per min. 1.50 h.-p.
For an amalgamating barrel, making 30 revolutions per min. 2.50 h.-p.
For a mechanical batea, making 30 revolutions per min. 1.00 h.-p."

The writer has had small practical experience of the working of that excellent hydraulic motor, the Pelton wheel, but if by horse-power in the table given is meant nominal horse-power, it appears to be high. Working with 800 cwt. stamps, 80 blows a minute, one horse-power nominal will be found sufficient with any good modern engine, which has no further burden than raising the stamps and pumping the feed water. It is always well, however, particularly when providing engine power, to err on the right side, and make provision for more than is absolutely needed for actual battery requirements. This rule applies with equal potency to pumping engines.


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