. Electric railway journal . steam boiler and the laying of a pipe line for onlytemporary use. To this must be added the cost of tearingdown the plant when the job is completed. The portabletype of air compressor reduced difficulties somewhat andportable outfits of many varieties have been developed inthe last few years. The Ingersoll-Rand Company has recently introduceda light-weight gasoline engine-driven unit, built in twosizes, to be known as the Imperial Tjrpe 14 portablecompressor. These are all-steel outfits and the power plant of eachconsists of a duplex, vertical compressor, driven at
. Electric railway journal . steam boiler and the laying of a pipe line for onlytemporary use. To this must be added the cost of tearingdown the plant when the job is completed. The portabletype of air compressor reduced difficulties somewhat andportable outfits of many varieties have been developed inthe last few years. The Ingersoll-Rand Company has recently introduceda light-weight gasoline engine-driven unit, built in twosizes, to be known as the Imperial Tjrpe 14 portablecompressor. These are all-steel outfits and the power plant of eachconsists of a duplex, vertical compressor, driven at highspeed, by a four cylinder, four cycle, tractor type gasolinemotor. The outfit, being designed especially for portableuse, has unnecessary weight eliminated. The largermachines, of 310 cu. ft. capacity, weigh only 6000 lb. andthe 118 cu. ft. unit 400 lb. The compressors have cylinders cast en bloc, with cyl-inder heads, valve chambers and water jackets intake aiid discharge valves are of plate type and are. PORTABLE COMPRESSOR 210 CAPACITY located directly over the cylinder bore. Crankshafts andconnecting rods are drop forgings. Air pistons arefitted with three-piece piston rings and, in addition, withan oil wiper ring. This latter returns all surplus oil fromthe cylinder walls to the crankcase, and is claimed to obviatethe difficulty caused by having the air carry an excess ofoil into the receiver. All bearings are die castings of anti-friction holes in the crankcase permit convenient access foradjusting main bearings and those of the crankpins. Allparts are lubricated by splash from an oil reservoir in thecrankcase. The compressors are provided with inlet unloading de-vices which automatically close the compressor intake whenthe receiver pressure rises above a predetermined limit, andpermit the machine to again take up it load when the pres-sure has fallen a definite amount. The gasoline driving motors are of long-stroke type,and operate at
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