. Railway mechanical engineer . e other two valves the equal armed lever it obtains a valve travelequal to those of the outside cylinders, and as the pivot ofthe equal armed lever is on the free end of the long lever,the position of the shorter lever fulcrum relatively to thecylinders is altered by the vibration of the longer lever. The boiler is large for an eight-wheeled locomotive. Thebarrel is 72 in. diameter outside, and 11 ft. SJ-l in long,and is made from a single plate % in. thick. The totalheating surface of the boiler and superheater is 2,308 sq. grate area is
. Railway mechanical engineer . e other two valves the equal armed lever it obtains a valve travelequal to those of the outside cylinders, and as the pivot ofthe equal armed lever is on the free end of the long lever,the position of the shorter lever fulcrum relatively to thecylinders is altered by the vibration of the longer lever. The boiler is large for an eight-wheeled locomotive. Thebarrel is 72 in. diameter outside, and 11 ft. SJ-l in long,and is made from a single plate % in. thick. The totalheating surface of the boiler and superheater is 2,308 sq. grate area is 28 sq. ft. The cylinders are each 18^4 26 in., the steam pressure carried is 180 lb., and thecoupled wheels are 68 in. in diameter. This combinationgives a tractive force of 30,030 lb. Great care has beenexercised in the design of these engines with a view of keep-ing down weight, especially in the motion parts, which aremade from chrome-nickel steel heat treated. The crossheads work in guides of the three-liar type, and. Fig. 7—Great Eastern. 0-6-0 Type, Inside Connected. Freight Locomotive with the latter loaded with 11,200 lb. of coal and 3,500 water, is 208,000 lb. Valve Gear for Three-Cylinder Locomotives In 1919 H. N. Gresley, locomotive superintendent of theGreat Northern Railway, built at the Doncaster shops thefirst of a ver}- interesting class of locomotives for fast freightservice. The engines, which embody several novel features,and of which several have now been built, have three cyl-inders, and are of the 2-6-0 type. All three cylinders driveonto the center axle, that between the frames through a bal-anced built up crank axle, the cylinder center line beinginclined at 1 in 8 in order that the main rod may clear theleading coupled axle. Piston valves having inside admission distribute the steam,the three valves being operated by two sets of Walschaertgear applied to the outside motion. The manner in whichthis is accomplished is as follows: A lever o
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
