. The Street railway journal . ensitive toregulate to per cent in load variations from zero to 125 percent. Roller bearings are provided in the governor bearings andthe principal mechanism consists of two balance levers, whichare connected to an eccentric sleeve which surrounds the shaft,and which is pivoted at one side, so controlling the throw of theeccentric rod to a nicety. The pillow blocks for the crank shaft have the cover fitted in adiagonal position, and the shell is provided with an oil chamberwith recesses for the oiling chains. The engine frame is extended with stuffing box exp
. The Street railway journal . ensitive toregulate to per cent in load variations from zero to 125 percent. Roller bearings are provided in the governor bearings andthe principal mechanism consists of two balance levers, whichare connected to an eccentric sleeve which surrounds the shaft,and which is pivoted at one side, so controlling the throw of theeccentric rod to a nicety. The pillow blocks for the crank shaft have the cover fitted in adiagonal position, and the shell is provided with an oil chamberwith recesses for the oiling chains. The engine frame is extended with stuffing box exposed in such positions as to provide for con-stant use and easy access, and prevents the water of condensationfrom getting into the oil supply, should a leak occur. The oil isprevented by a guard from getting on the piston rod. In theprocess of manufacture, the pistons, piston-valves, pins and otherparts are all ground to an accurate fit, and micrometer recordsmade of each piece, so that any part of an engine can be duplicated. 252 STREET RAILWAY JOURNAL. [Vol. XV. No. 4. at any time after it leaves the works. The crank disc, includingthe pin, is cast in one solid piece of steel, the mould being placedin a horizontal position, with the pin down, producing a densemetal in the pin. This is afterward turned and properly fitted,when the disc is shrunk on the shaft and keyed in position. Every engine is thoroughly tested before it is shipped, and forthis purpose metal bed plates on heavy masonry are providedwith suitable channels for clamping them in place. When in posi-tion for testing, the engine bed is supported on metallic points,and the machine is first run for adjusting the governing and valvemechanism. Next, the fly-wheel is accurately corrected to a run-ning balance, and finally each engine is so perfected that it is runupon the metallic points without fastening. Very accurate andelaborate tests are made to perfect the governing mechanism ofeach engine, and when the machines
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
