. Bulletin . SANDSTONE SAWMILLS AND FINISHING PLANTS. 71 well for elevation. A device employed by one millman to assistmovement of the steel is a belt made of discarded belting and pro-vided with crossbars, by which tlie steel is carried back to the pumpwell. An air lift is now employed successfully in a number of raising sand in water a well of suthcient depth is required tohave about one and one-half times as much pipe submerged as abovethe water level. A jet of compressed air enters at the bottom, whichagitates and aerates the water, causing it to rise in the pipe. Thesuccessful
. Bulletin . SANDSTONE SAWMILLS AND FINISHING PLANTS. 71 well for elevation. A device employed by one millman to assistmovement of the steel is a belt made of discarded belting and pro-vided with crossbars, by which tlie steel is carried back to the pumpwell. An air lift is now employed successfully in a number of raising sand in water a well of suthcient depth is required tohave about one and one-half times as much pipe submerged as abovethe water level. A jet of compressed air enters at the bottom, whichagitates and aerates the water, causing it to rise in the pipe. Thesuccessful use of an air lift with crushed steel has not yet been dem-onstrated so far as is known. It is evident that a greater volume ofair and more agitation would be necessary on account of the steelhaving a higher specific gravity than the sand. The great advan-tage of the air lift consists in its simplicity and the absence of mov-ing or rotating parts, which are rapidly worn out by sand andespecially by crushed st
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
