. American engineer . etails revised for the benefit of the newengines is the trailer truck oil cellar. In this the lower portionof the cover casting and the cellar are cast in one piece. Thiseliminates joints in the cellar which permit oil to leak out. Wagon top boilers with two steam domes are used on locomotives. The rear dome is placed on the wagon-top,while the forward dome is located near the front end of thebarrel. Steam is conveyed from the rear dome to the forwarddome through a pair of 5-in. pipes. The forward dome contains Febeuarv, 1912. AMI ICAN ENGINEER. 69 the throttle, an
. American engineer . etails revised for the benefit of the newengines is the trailer truck oil cellar. In this the lower portionof the cover casting and the cellar are cast in one piece. Thiseliminates joints in the cellar which permit oil to leak out. Wagon top boilers with two steam domes are used on locomotives. The rear dome is placed on the wagon-top,while the forward dome is located near the front end of thebarrel. Steam is conveyed from the rear dome to the forwarddome through a pair of 5-in. pipes. The forward dome contains Febeuarv, 1912. AMI ICAN ENGINEER. 69 the throttle, and as coinnuiiiicatinn hetvvecn its interior and tlicboiler is cut off liy a plate, tlie steam supply for the cylindersis drawn entirely Irnni the rear dome, which is at the highestpart of the boiler. The throttle takes steam through the top only,and communicates with the external dry pipe. In the engines witli Buck-Jacobs superheaters, tlie superheatingchamber is 37 in. in length, its forward tube sheet being 24/j Frame Brace Ahead of Third Pedestal. back of the center line of the stack. An intermediate chamber isplaced between the superheater and the main evaporating sec-tion of the boiler, and as this chamber can be entered througha manhole the tube ends are easily accessible. The superheatertubes are welded into the tube slieet at the back end, and rolledat the front end. Steam enters the superheater on the top cen-ter line and is guided by internal baffle plates so that it fol- abovc the center line of the heater and is applied to facilitatethe removal of the boiler tubes. The 3-in. tubes are grouped inthe lower part of the heater. In the boilers equipped with Schmidt superheaters the fronttube sheet is placed SOj/j in. back of the stack center. A largeopening is cut in the shell, immediately above thesuperheater header, and tliis opening is covered by a saddle-shaped casting. There are three openings through this center opening communicates with
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
