. American engineer and railroad journal . d shoe forwardly andrearwardly, and thereby decrease or increase the area of thegrate to which air will be supplied from said box. In fig. 1 the full active surface of the grate is shown sup-plied with air, as the shoe is located below the tail-piece overwhich the ashes are discharged ; but if the rear end of the ashbox should be rocked upwardly the said shoe would move upto a point above said tail-piece, and thereby shut off a corre-sponding area of the grate on which fuel is located from thesupply of air passing in through said ash box. By this con-
. American engineer and railroad journal . d shoe forwardly andrearwardly, and thereby decrease or increase the area of thegrate to which air will be supplied from said box. In fig. 1 the full active surface of the grate is shown sup-plied with air, as the shoe is located below the tail-piece overwhich the ashes are discharged ; but if the rear end of the ashbox should be rocked upwardly the said shoe would move upto a point above said tail-piece, and thereby shut off a corre-sponding area of the grate on which fuel is located from thesupply of air passing in through said ash box. By this con-struction the air can be concentrated on the incandescent por-tion of the fuel or on the green fuel. Suitable means can beemployed to rock the said shaft and pan. A toothed seg-ment, 5, rigid with the said shaft and in engagement is shownwith a worm, 6, carried by the inclined shaft 7, suitably jour-naled and extending forwardly to the front exterior of thefurnace, where it can be provided with a suitable handle, W,for rotating the BUTMANS FURNACE AND MECHANICAL STOKER. The ash box has the upwardly curving bottom, so that thearea of the ash box gradually decreases rearwardly, whichassists in throwing the air outwardly and upwardly throughthe grate-bars where the air is most needed—that is, at thepoint of greatest heat directly over the central portion of thedrum. The inventor says : The quantity of fuel consumed per hour can be readilyregulated either by increasing or decreasing the speed of thegrate drum ; by increasing or decreasing the depth of fuel bymeans of raising or lowering the hopper gate ; by means ofthe damper in regulating the admission of air to the fuel, orby placing the box in such a position as to increase or de-crease the actual grate area supplied with air. Mr. T. R. Butman. of Chicago, is the inventor. His patentis dated September 18, 1894, and numbered 526,341. WORTHINGTON S SECTIONAL STEAM-BOILER. The object of this invention, shown in fig. 2, is
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
