. The Street railway journal . ELECTRICALLY-DRIVEN AIR COMPRESSOR operate when the load is more than can be carried by one unit. This arrangement permits of equalizing the work on thetwo compressors, and in case of accident to one it can easilybe put out of service for repairs. It is the intention to have AUTOMATIC STARTING DEVICE up the expansion or contraction resulting from differences intemperature without any extra undue strains. The capacityof this intercooler is sufficient, so that a prac-tically constant pressure is maintained within it,thus allowing the passage of air through it at ac
. The Street railway journal . ELECTRICALLY-DRIVEN AIR COMPRESSOR operate when the load is more than can be carried by one unit. This arrangement permits of equalizing the work on thetwo compressors, and in case of accident to one it can easilybe put out of service for repairs. It is the intention to have AUTOMATIC STARTING DEVICE up the expansion or contraction resulting from differences intemperature without any extra undue strains. The capacityof this intercooler is sufficient, so that a prac-tically constant pressure is maintained within it,thus allowing the passage of air through it at acomparatively low velocity, giving ample time forcooling. The compressors themselves are equip-ped throughout with ample cooling jackets on aircylinders and heads, and are piped for circulatingwater connections through the intercooler andjackets. Caution should be used in placing theinlet and discharge valves in the high-pressurecylinder, where 260 lbs. unbalanced pressure isencountered, in such a position that if any acci-dent
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
