. The Street railway journal . the connecting rod. The oilwells anii the openings in the side of the crank chamber are pro-vided with covers held in place with suitable fastenings. An airpassage directly over the top of the cylinders and extending fromend to end is cored in the casting, thus connecting the two outletparts in the cylinder heads, and from this passage is led the mainoutlet or reservoir pipe. Each cylinder is single acting, and isprovided with radiating fins, which tend to considerably increasethe strength of the cylinder walls and to reduce the cylindertemperature. There are but
. The Street railway journal . the connecting rod. The oilwells anii the openings in the side of the crank chamber are pro-vided with covers held in place with suitable fastenings. An airpassage directly over the top of the cylinders and extending fromend to end is cored in the casting, thus connecting the two outletparts in the cylinder heads, and from this passage is led the mainoutlet or reservoir pipe. Each cylinder is single acting, and isprovided with radiating fins, which tend to considerably increasethe strength of the cylinder walls and to reduce the cylindertemperature. There are but four bearings all told, including armature or;crankshaft and connecting rod bearings. The shaft bearings, ara,lubricated with oily waste packed in oil wells and pressed againstthe shaft, similar in construction to the G. E. 66 motor. Theconnecting rod bearings are self-lubricated by a special devicewhich conducts a small cpiantity of oil to the bearings at eachrevolution of the armature. The same device lubricates the FIG. II.—AIR COMPRESSOR AND MOTOR The two pistons are rigidly connected together in the form ofa hollow cylinder, with a head at each end and the sides cut piston carries the wrist pin, and by this means both pistonsare operated with one connecting rod. This double piston isprovided at each end with two cast-iron spring packing rings. The connecting rod is of gun metal, cast in one piece, of anI-beam section, and ribbed in such a manner as to provide great-est strength with the least weight. It may be taken out by re-moving the wrist pin without disturbing any other portion of thecompressor. Thei\ arc two cylinder heads, one bolted to each of the cylin- 494 STREET RAILWAY JOURNAL. [Vol. XVIIL No. 14. ders and each liead is pro\idcd with finislied places for the inletand outlet ^■alves. A chamber is ciired around the outlet valvefor the free escape of air to the connecting passage in the cylin-ders. For the purpose of making the valves easily
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
