. The street railway review . air which is returning at that pressure from themiddle lube of the intcrchangcr to the compressor D. The compressed air on leaving each compressor, passes througha coil in a water cooler which serves also to water-jacket the com-pressor cylinders. A small quantity of water is drawn in alongwith the air by the low pressure cylinder, and this, together with thenatural moisture of the air, is extracted as completely as possible,first by means of a separator F, and then by passing the compressedair through the coil in G in a bath of ice and salt before it goesinto the
. The street railway review . air which is returning at that pressure from themiddle lube of the intcrchangcr to the compressor D. The compressed air on leaving each compressor, passes througha coil in a water cooler which serves also to water-jacket the com-pressor cylinders. A small quantity of water is drawn in alongwith the air by the low pressure cylinder, and this, together with thenatural moisture of the air, is extracted as completely as possible,first by means of a separator F, and then by passing the compressedair through the coil in G in a bath of ice and salt before it goesinto the interchanger. It is absolutely necessary that the air be dry,for during the expansion from the high to the low pressure in theinterchanger, and moisture in the air will freeze in the expansionvalves and clog them, making them useless. The interchanger isinclosed in a case packed with sheeps wool. Mr. Triplers apparatus is shown in Fig. 3, and corresponds inprinciple and action with that of Lindc. Mr. Tripler claims priority. £xpansionVa/ve \yoltre/orOrotringLipuii/ Air of invention, having discovered this method during 1S89-90. In Triplers apparatus the air is compressed to 2,500 lb. per sq. a three-stage air-compressor, cooling the air between each stage,and after the third stage by the after-cooler shown. Then theair is passed through a separator, then to the liquefying apparatus which consists of a scries of coils of pipe arranged in several con-centric cylindrical compartments in the two large liqucficrs coils of pipe terminate in a specially designed expansion valveand orifice. The high pressure air entering the liqueficr passesthrough the coils until it reaches the expansion valve. Here theair is expended in the chamber to very nearly atmospheric pressure,and in expanding from the high pressure of 2,500 lb. is reduced intemperature, and this cold expanded air in passing over the coilsfrom which it has just issued reduces the air under the high pressureth
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
