. Electric railway journal . l. As in the original machine, the entire weight (about5500 lb.) is concentrated over the grinding wheels so thatthe maximum cut can be made without danger of chatter-ing. In addition, the possibility of chattering because ofworn bearings has been forestalled by mounting the emerywheel on a shaft which runs in two main bearings and anew type of center bearing. This center bearing is drawnup by a flat spring from the saddle casting. As the springis always under heavy tension, its effect is to draw theemery wheel spindle tightly against the top of the other twobearin
. Electric railway journal . l. As in the original machine, the entire weight (about5500 lb.) is concentrated over the grinding wheels so thatthe maximum cut can be made without danger of chatter-ing. In addition, the possibility of chattering because ofworn bearings has been forestalled by mounting the emerywheel on a shaft which runs in two main bearings and anew type of center bearing. This center bearing is drawnup by a flat spring from the saddle casting. As the springis always under heavy tension, its effect is to draw theemery wheel spindle tightly against the top of the other twobearings, thus holding the emery wheel against chatteringand also preventing any tendency it might have to swayunsteadily because of worn bearings. The use of motor power and the concentration of weightdirectly over the emery wheels make it possible to takedeep cuts and to run at most economical speed. Thus, themost efficient results are secured by running at 1833 ,which corresponds to an initial peripheral speed of 6719 Non-Chattering Rail Grinder per minute for a new wheel and proportionately smallerperipheral speeds as the diameter of the wheel decreaseswith wear. The power equipment consists of two 5-hp in-closed motors, which are belt-connected to the emerywheels, and one 3^-hp inclosed motor for traction. A third improvement in this machine is the addition ofa substantial canopy, which will withstand heavy winds andshed water at the ends but not at the sides. The latterfeature permits the crew to work in a heavy rainstormwith no discomfort from dripping water. January 4, 1913.] ELECTRIC RAILWAY? JOURNAL 4i LONDON LETTER (From Our Regular Correspondent) The report of the Glasgow Corporation Tramways forthe half-year shows that 150,000,000 passengers were car-ried, an increase of fully 21,000,000, due largely to thedoubling of halfpenny distances. The receipts for the sixmonths were £492,000, a reduction of nearly £10,000 on thecorresponding period last year. Halfpen
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