. The street railway review . manner. Without this detail properly provided for it is necessaryto stoke iKrth ill the furnace maga/ini- and through fire door, spread-ing live coah over dead sputs. This means both labor and fuelloss. There is no particular objection to feeding cither all coarseor all fine coal to a furnace, the only practical re(|uisile being ihalthe coal shall burn uniformly over the entire grate, though not neces-tarily of a uniform thickness, and by the time Ihe fuel reaches the discharge to the ash pit the Fine belweon the consumed and burningcoal be fairly straight; if it
. The street railway review . manner. Without this detail properly provided for it is necessaryto stoke iKrth ill the furnace maga/ini- and through fire door, spread-ing live coah over dead sputs. This means both labor and fuelloss. There is no particular objection to feeding cither all coarseor all fine coal to a furnace, the only practical re(|uisile being ihalthe coal shall burn uniformly over the entire grate, though not neces-tarily of a uniform thickness, and by the time Ihe fuel reaches the discharge to the ash pit the Fine belweon the consumed and burningcoal be fairly straight; if it be otherwise, the furnace cannot berun to its full capacity without considerable loss in fuel and damageto the furnace due to carrying live coals into the ash pit. Wlien we take into consideration the fact that coal has becomesorted while in transit, and each handling tends to do the same, thedifficulty of mixing and retaining it mixed up to time of placing itim the prate is loo great to undertake. There remains virtually but. •mrrr, 7*7 FIG. 7. one method for us to pursue to keep a uniform tliickncss of thebed of coal and a fairly uniform grade of fineness across llie entirewidth of furnace, and that is as sliown in Fig. 8. The stationary hopper spout discharges into a reciprocating hop-I)er or spreader, which travels backward and forward across themagazine. Owing to the spreading action in receiving and thespreading action in discharging, the coal would be fed in layers ofcoarse and fine, but each foot in width would be layered the same. ■Coarse coal could be fed out of the hopper one time, then all fine,but the spreader would distribute a small amount of each over theentire width of the furnace. There is still another factor that enters into the maintenance01 a uniform straight dead fire line. In the case of boilers in abattery, the side of the furnace alongside of an outside wall willbe very likely to carry live coal over, due to slower combustionagainst the cooler wall
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
