. The street railway review . fiehefya/ye , Engine \fioomFloor-^ ii^:^. PIG. 17. the trench sliould be smeared with portland cement on the sidesand bottom. Avoid placing valves in trenches. From the feed pump, wrought iron pipe carries the feed waterto the heater—or, it cold water is used, direct to the boiler. It iscustomary in large plants to use both systems, so that the heatercan be cut out of service, if necessary. Feed pipes for hot watershould always be of brass, with brass valves and fittings. Very longruns are sometimes made of cast iron, as far as the economizers,

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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads