Compressed air . attern, and cranks are of balanced disktype. High and low-pressure air cylindersare completeh water-jacketed on headsand barrels. Cold air is drawn from out-side the building through a in an intake bracket supported on thecompressor foundation. The . Sergeantpiston inlet valve handles the intake onboth high and low-pressure discharge valves are used. Avertical receiver intercooler stands be-tween the cylinders, 48 inches in diameterand 13^2 feet high, with tinned brass tubesthrough which the cooling water circu-lates. Steam cylinders are
Compressed air . attern, and cranks are of balanced disktype. High and low-pressure air cylindersare completeh water-jacketed on headsand barrels. Cold air is drawn from out-side the building through a in an intake bracket supported on thecompressor foundation. The . Sergeantpiston inlet valve handles the intake onboth high and low-pressure discharge valves are used. Avertical receiver intercooler stands be-tween the cylinders, 48 inches in diameterand 13^2 feet high, with tinned brass tubesthrough which the cooling water circu-lates. Steam cylinders are 18 and 36 inchesin diameter; air cylinders. 20^^ and 32%inches. The stroke is 48 inches. Normalspeed is 72 revolutions per minute, atwhich the free air capacity of the corn-pressor is cubic feet per minute. Airpressure is 80 pounds. The compressor building is an iron-covered steel-framed structure lined withsheathing and floored with matched solid concrete foundation capped with COMPRESSED AIR. 3960. 3961 COMPRESSED AIR. finished stone supports the ilhistration shows the interior of theengine-room with the intercooler in theright foreground. The stairway on theright leads to the basement, which con-tains all auxiliaries, beside an engine-driven generator for lighting purposes. In a separate building, close at hand,is another Ingersoll-Sergeant air com-pressor—a survivor from early days of the Champion mine. At one time thissmall machine furnished all the air re-quired for rock drills; to-day it is main-tained as an auxiliary to the larger com-pressor. It is a straight-line type, steam-driven, with simple steam and air cylin-ders, i8 and i85<t inches in diameter, re-spectively, and a stroke of 24 inches. Atthe rated speed of 94 revolutionsper minute its free air capacityis 656 cubic feet oer minute, de-livered at 80 pounds pressure. Thesteam end is fitted with adjustable cut-offvalves of Meyer type; and Sergeant pis-ton inlet and direct-lift dis
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcompres, bookyear1896
