. American engineer and railroad journal . y low locomotives are fitted with 14-in. piston valves. These locomotives are fitted with the Elvin grease lubrica-tion for the driving boxes. The rod cups are also fitted withgrease lubricators. The links are 3% ins. wide and the valvemotion stresses are in direct line with all pins in double leading truck, shown in one of the engravings, is madevery compact and simple by the use of cast steel and by plac-ing coil springs over the boxes. This truck has 8 ins. of lat-eral motion. The trailer truck is of the improved Player typew
. American engineer and railroad journal . y low locomotives are fitted with 14-in. piston valves. These locomotives are fitted with the Elvin grease lubrica-tion for the driving boxes. The rod cups are also fitted withgrease lubricators. The links are 3% ins. wide and the valvemotion stresses are in direct line with all pins in double leading truck, shown in one of the engravings, is madevery compact and simple by the use of cast steel and by plac-ing coil springs over the boxes. This truck has 8 ins. of lat-eral motion. The trailer truck is of the improved Player typewith equalizers instead of leaf springs over the boxes. Coilsprings are used at the rear ends of the equalizers and theseare fitted with McCord spring dampeners. This truck givesspace for an unusually good ash pan clearance. It providesa total lateral motion of 9 ins., which is required on accountof the long wheel base. The stack and front end are arranged in accordance wjth theAmerican Engineeb tests on locomotive draft appliance, the re-. NEW MOTOR SPEED CONTROLLER. The rheocrat is a new type of motor speed controller, whichmay be used with any standard motor, and while its design isradically different from the ordinary type of controller, itssize and external appearance are much the same, as will benoted by reference to the illustrations. Its principal advan-tages are the uniform and minute gradations of speed whichit furnishes over a wide range, the ability to stand abuse undersevere usage, its economy of operation, and the fact that themotor maintains its speed regardless of the load and that thetorque is constant at the lower speeds over a range of about 3to 1, which is obtained by changing the effective voltage at themotor. This range of 3 to 1 may be increased by the addi-tion to the system of field control, thus permitting a range ofspeed of from 3% to 1 up to 5 to 1, and even higher ratiosin special cases. The principle of the system consists, briefly, in the inter-mit
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
