Transactions . d; and the other, a man-way of 20-inch steel pipe, plainat the inside end, and with a heavy flange shrunk on at theother, to which a heavily ribbed blind flange, 2J inches thick,was bolted. A small pipe tapped into the blind flange carrieda hydraulic pressure-gauge. The 20-inch pipe was anchoredin the masonry by three clamps, and the flanges were bolted tothree long rods passing through the wall with washers 5-inch pipe, with a flange on the inside end, was also an-chored by three clamps, the arms of which radiated in differentdirections. As it is nearly 800 feet belo
Transactions . d; and the other, a man-way of 20-inch steel pipe, plainat the inside end, and with a heavy flange shrunk on at theother, to which a heavily ribbed blind flange, 2J inches thick,was bolted. A small pipe tapped into the blind flange carrieda hydraulic pressure-gauge. The 20-inch pipe was anchoredin the masonry by three clamps, and the flanges were bolted tothree long rods passing through the wall with washers 5-inch pipe, with a flange on the inside end, was also an-chored by three clamps, the arms of which radiated in differentdirections. As it is nearly 800 feet below the surface, and thesource of the water was unknown, the pipe and fittings were de-signed to withstand a pressure of 350 pounds to the square inch. The water was shut off about , May 13, 1897, and alittle before noon the next day the pressure was 100 pounds,rising to 215 pounds at and 240 pounds three-quarters ofan hour later. The dam leaked about 30 gallons a minute, the 402 A MINE-LAM. Fig. Fig. 2.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
