. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. steamengine. These pistons areturned out of the solid forgingwhich forms the stamp stems,are 5I in. in diameter, andare fitted with three sets ofpiston rings, making themsteam tight. The pistonrods which pass through thestuffing boxes are 4 in. indiameter, therefore, the steampressure which is admittedunder the piston to raise thestamp, is confined to an areawhich ; is due to the dif-ference between the diameterof the piston and the pistonrod, amounting to an annularring about
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. steamengine. These pistons areturned out of the solid forgingwhich forms the stamp stems,are 5I in. in diameter, andare fitted with three sets ofpiston rings, making themsteam tight. The pistonrods which pass through thestuffing boxes are 4 in. indiameter, therefore, the steampressure which is admittedunder the piston to raise thestamp, is confined to an areawhich ; is due to the dif-ference between the diameterof the piston and the pistonrod, amounting to an annularring about | in. wide, thisarea is small, but sufficientto quickly raise thestamps, the total weightof which is but 300 lb. ; Either piston in itstravel toward the top ofits cylinder passes asmall steam port, which ladmits the pressure tothe valve mechanismand moves the valve , -^. ,- -i ::. to its opposite position, the movement of the valve cuts off the admission of steam to the under-side of the piston, and admits to the underside of its mate, at thesame time connecting the top and bottom ends of the first-mentioned 18. 2 74 MACHINERY FOR METALLIFEROUS MINES. cylinder together, thus allowing the confined steam which is holding thestamp up, to be expanded around the piston to its upper side, andacting expansively upon the large area there encountered, to so ener-getically assist the 300 lb. stamp in its downward movement as tostrike a blow upon the die equal to that of an 800 to 1000 stamp. The pistons alternate with each other perfectly, and when the valve ismoved back to again admit steam to the underside of the first-mentionedpiston, it also connects the top side with the exhaust port, so that thesteam remaining after the blow has been struck is passed into theatmosphere. This arrangement makes it possible to use the steam ex-pansively, and to obtain the same crushing effect with each drop of a300 lb. stamp as would be obtained with a gravity stamp of 800 to1000 lb. droppi
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1902
