. Electric railway journal . mp plunger is IV2 in. in diameter, and has a It is connected by a short link to a small crankon the compressor crankshaft. The water is taken inat the bottom of the pump through a ball valve. Theoutlet pipe, which is just above the intake, is providedwith a check valve. This method of supplying cooling water for an aircompressor is simple and can be readily applied in anyshop as one means of reducing the water bill. Rail Grinders on the Boston ElevatedRailway The Boston Elevated Railway since 1899 has beenusing a flexible shaft grinder made up in the c
. Electric railway journal . mp plunger is IV2 in. in diameter, and has a It is connected by a short link to a small crankon the compressor crankshaft. The water is taken inat the bottom of the pump through a ball valve. Theoutlet pipe, which is just above the intake, is providedwith a check valve. This method of supplying cooling water for an aircompressor is simple and can be readily applied in anyshop as one means of reducing the water bill. Rail Grinders on the Boston ElevatedRailway The Boston Elevated Railway since 1899 has beenusing a flexible shaft grinder made up in the companysshops at a cost of about $350 which includes a motor installed on a light two-wheel cart, asshown in the accompanying illustration. The shaft ofthis grinder is made by the Stow Manufacturing Com-pany, of Binghamton, N. Y. The shaft is 8 ft. inlength and connected to the motor through a universaljoint. The company now has six of these machines in serv-ice. These grinders can be used for work in grooves,. PORTABLE RAIL GRINDER USED IN BOSTON, MASS. on the tread, and along the gage line. The wheel usedis 10 in. in diameter and 1 in. thick for groove or gage-line work, and in. thick for the tread grinding. Considerable work is done with this grinder follow-ing the electric welding by the three Indianapolis weld-ers. Other uses are grinding center plates and specialwork. The cart which carries the motor stands alongsidethe track without impeding traffic to any extent. Thewheel and shaft are easily removed on the approach ofa car, and as readily replaced in working position, theweight of this portion of the machine being about 30 lb. With skillful manipulation, which an intelligent track-man soon acquires, excellent work can be done with thismachine. The roadmaster estimates that the averagecost for grinding joints is about 40 cents each. September 23, 1916] ELECTRIC RAILWAY JOURNAL 543 150-Lb. Third-Rail for New Lines ofthe Interborough in New York City Th
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