. Science of railways . and operated by steam taken from boiler at gaugepressure. The Elevator Engine operates at speeds varyingfrom 400 to 600 revolutions per minute, and drives the stokerby a 20 to 1 worm gear which transmits the power to theElevator Chain through the Sprocket Wheel Casing. The Elevator Chain drives a sprocket and shaft in elevatorhopper at bottom of stoker which in turn operates the eccen-tric attached to the bell crank of coal screen, and this lowerdriven elevator chain sprocket shaft also carries anothersprocket on front of hopper which drives the helicoid screwconveyor a
. Science of railways . and operated by steam taken from boiler at gaugepressure. The Elevator Engine operates at speeds varyingfrom 400 to 600 revolutions per minute, and drives the stokerby a 20 to 1 worm gear which transmits the power to theElevator Chain through the Sprocket Wheel Casing. The Elevator Chain drives a sprocket and shaft in elevatorhopper at bottom of stoker which in turn operates the eccen-tric attached to the bell crank of coal screen, and this lowerdriven elevator chain sprocket shaft also carries anothersprocket on front of hopper which drives the helicoid screwconveyor as shown in Figs. 3, 25 and 26. Variahle-Speed Elevator Engine—4x3^. The elevatorengine is of the single acting type, running at speeds of 400 no LOCOMOTIVE APPLIANCES. to 600 revolutions per minute, and is controlled by a shaftgovernor inside of crank case running in oil and regulatingthe valve cut-off. The governor has an outside lever with quadrant as shownin Fig. 4, which permits setting the engine speed at any one. Fig. 4—Front View of 4x31/^ Variable-Speed Elevator Engine, Com-plete with Friction Clutch, Sprocket Wheel Casing,Variable-Speed Governor Lever and Quadrant of seven speeds, which are constant at each notch of thegovernor control. The Sprocket Wheel Casing, to which the Elevator Engineis attached, also carries the special Friction Clutch and leverconnections as shown in Fig. 6. The engine is oiled from two sources; a splash system, con- LOCOMOTIVE APPLIANCES. Ill sisting of oil film on water level in crank case, and by oil reach-ing the engine cylinder through the steam line from tap tomain locomotive lubricator. The splash system oil level is
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