California mines and minerals . of 250feet below the Sutro Tunnel. The distance for which the manufac-turers designed the machine is 500 feet below that point. The writer visited the Comstock Lode during the past month, andfound the machine working very satisfactorily, and it was at that timedischarging about 4,000 gallons per minute, using 130 miners inches(each one and one-half cubic feet) of pressure water. The waterpressure was under a head of 2,000 feet, and the lift at that timewas 250 feet. The highest efficiency attained since commencing tooperate was about forty per cent. A machine of
California mines and minerals . of 250feet below the Sutro Tunnel. The distance for which the manufac-turers designed the machine is 500 feet below that point. The writer visited the Comstock Lode during the past month, andfound the machine working very satisfactorily, and it was at that timedischarging about 4,000 gallons per minute, using 130 miners inches(each one and one-half cubic feet) of pressure water. The waterpressure was under a head of 2,000 feet, and the lift at that timewas 250 feet. The highest efficiency attained since commencing tooperate was about forty per cent. A machine of this kind, where water pressure is available, and theexpense of same not prohibitive, is a very cheap way of unwateringauriferous mines, particularly if the head is sufficient to allow themachine to work successfully. The development of the Evans system on the Comstock Lode willbe watched with interest by engineers throughout all parts of thecountry, and, up to date, the success attained is very gratifying tothe
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidcaliforniaminesm00cali
