Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . O HK g Fig. 112 is a sectional view of a vertical Cahallboiler with a Mansfield chain grate stoker, and Fig. 113shows the same stoker withdrawn from the boiler. The Coxe mechanical stoker operates upon the same MECHANICAL STOKERS 339 general principles as do those previously described,being of the chain grate type, but it has in addition aseries of air chambers just underneath the uppertraveling grate. These air chambers are made of sheetiron and are open at the top and provided with dampersfor re
Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . O HK g Fig. 112 is a sectional view of a vertical Cahallboiler with a Mansfield chain grate stoker, and Fig. 113shows the same stoker withdrawn from the boiler. The Coxe mechanical stoker operates upon the same MECHANICAL STOKERS 339 general principles as do those previously described,being of the chain grate type, but it has in addition aseries of air chambers just underneath the uppertraveling grate. These air chambers are made of sheetiron and are open at the top and provided with dampersfor regulating the air pressure for different sections ofthe grate. The air blast is supplied by a fan. Anotherfeatureof this stoker is a water chamber for the bottomsection of the grate to travel through on its FIGURE 114. The stoker has wrought iron T bars extend-ing across the furnace and attached to the traveling-chains. These T bars carry the small cast iron sectionscomposing the grate. A screw conveyor is alsoplaced in the ash pit for the purpose of carrying theashes from the rear to the front of the pit. Fig. 114 isa sectional view of the Playford stoker attached to awater tube boiler. In class two may be included stokers having thegrates inclined more or less. In some varieties thegrates incline from front to rear, while in others they 340 ENGINEERING are made to incline from the side walls towards thecenter line of the furnace. In the Vicars mechanical stoker the grate bars aresomewhat of the shape of the ordinary grate and lie intwo tiers in a horizontal position. The lower or backtier next the bridge wall is stationary and is placedthere for the purpose of catching what coal is carriedover the ends of the upper or moving grate have a slow reciprocating motion w
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