Compressed air . ucted as to furnish a stop to theflashboard when it is fully open, to pre-vent the possibility of its passing beyonda point where it could be favorably actedupon, as the level of the water in the riverletreats to its normal height. These flash-boards have now gone through severalwinters, with their freshets, accompaniedby ice, logs or uprooted trees or otherfloating matter and have withstood all thiswithout resulting injury, and they haveworked satisfactorily in allowing increased COMPRESSED AIR. 3985 opportunity for the escape of freshet waterand in withholding the pond level
Compressed air . ucted as to furnish a stop to theflashboard when it is fully open, to pre-vent the possibility of its passing beyonda point where it could be favorably actedupon, as the level of the water in the riverletreats to its normal height. These flash-boards have now gone through severalwinters, with their freshets, accompaniedby ice, logs or uprooted trees or otherfloating matter and have withstood all thiswithout resulting injury, and they haveworked satisfactorily in allowing increased COMPRESSED AIR. 3985 opportunity for the escape of freshet waterand in withholding the pond level to itsnormal height. Having now brought the water to suchan elevation that we can avail of a suf-ficient fall between its surface and the sunk vertically to a depth 208 feet belowthe bed of the river or 215 feet below thesurface of the tail water, and at the bot-tom this shaft was enlarged into a cham-ber to contain the air separator. Theshaft is 24 feet in diameter and the cham- /Jr Supply fPipe-. Flash Boarrcf. FIG 4. tail water we will proceed to a furtherconsideration of the Norwich compressorplant with the available fall of 22 order to compress the air to a suf-ficient degree by submitting it to theweight of a head of water, a shaft was ber at the bottom is 52 feet in out of the chamber at the bot-tom is an air reservoir regulator, in theform of a tunnel from 15 to 20 feet inheight and 18 feet in width and having alength of about 100 feet. Suspended in 39S6 COMPRESSED AIR. the middle of the shaft is a downflow pipeof steel, about 14 feet in diameter, con-nected at the top with the head tank,through which water is received fromabove the dam, and at the bottom with aseparator chamber. This chamber is sur-mounted by an air resenoir, to containthe compressed air when separated fromthe water in which it had been entrained,and with which it had been carried to thebottom of the shaft. From the air reser-voir over the separator, a 16-inch leadingmain rise
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcompres, bookyear1896
