. Electric railway journal . has undergone radical improvements have been made in the leadingtypes of automatic stoker on the market, and some fouror five distinctly new stokers have been developed. We may divide the various machines offered for theconsideration of boiler plant owners into two generalclasses, overfeed and underfeed. Of the overfeed vari-eties we may further make a subdivision into fourclasses as follows: 1. The straight overfeed stoker, providing means formechanically feeding the coal downward on an inclinedgrate by gravity to a dump grate set at the bridge wallin
. Electric railway journal . has undergone radical improvements have been made in the leadingtypes of automatic stoker on the market, and some fouror five distinctly new stokers have been developed. We may divide the various machines offered for theconsideration of boiler plant owners into two generalclasses, overfeed and underfeed. Of the overfeed vari-eties we may further make a subdivision into fourclasses as follows: 1. The straight overfeed stoker, providing means formechanically feeding the coal downward on an inclinedgrate by gravity to a dump grate set at the bridge wallin the rear of the furnace. 2. The side-feed types which, by means of placingthe stoker out in front of the boiler usually in a Dutchoven, provide charging boxes on each side of the gratewhich supply coal through movable gates to inclinedgrates. These have their lowest point in the center ofthe furnace, where a clinker grinder revolving slowlycontinuously discharges the refuse. 3. That type which provides for charging the coal. 1256 ELECTRIC RAILWAY JOURNAL [Vol. XLVIII, No. 25 from the front end of the furnace on an inclined gratebuilt up in a series of steps or shelves, alternate gratebars having forward and backward motion which maybe adjusted over a reasonable range. This providesmeans for agitating the fuel bed and working the burn-ing coke toward the rear of the furnace, where theresultant refuse is deposited on the ordinary dumpplates used in this type of stoker. In this type meansare provided for cooling the grates by the circulationof water through pipes cast in them and connected withthe water drum of the boiler. The water flowing intothe bars is automatically checked when they are filledand discharge is made into the steam drum of theboiler. This stoker sometimes employs forced draft. 4. The chain or traveling grate, consisting of an end-less series of links actuated in their travel by gears andsprockets which keep the fuel constantly moving towardthe rear of the furna
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