. Electric railway journal . ley wheels during 1915 was per cent greaterthan in 1913 and per cent greater than in company believes that it is probably impossible toget as long life from either trolley wheels or trolleywires in a double trolley system as in the ordinary sys-tem because it is impracticable to align the trolley wiresaccurately. This is especially true in Havana, owingto the severe local conditions. The company has in all 401 motor cars, of which 378are closed passenger cars, one is an open car, two areparlor cars, one is a sightseeing car, thirteen are elec-tri
. Electric railway journal . ley wheels during 1915 was per cent greaterthan in 1913 and per cent greater than in company believes that it is probably impossible toget as long life from either trolley wheels or trolleywires in a double trolley system as in the ordinary sys-tem because it is impracticable to align the trolley wiresaccurately. This is especially true in Havana, owingto the severe local conditions. The company has in all 401 motor cars, of which 378are closed passenger cars, one is an open car, two areparlor cars, one is a sightseeing car, thirteen are elec-tric locomotives and the remaining eighteen are freightor service cars. A Unique Home-Made Slotting Device A home-made slotting device, of simple constructionyet effective as a tool, has been invented by C. C. West,master mechanic of the Galesburg Railway, Lighting &Power Company, Galesburg, 111. The design of thistool is such that it may be mounted, with slight changes,on any machine lathe in order to provide for the power. VIEW OF UNIQUE HOME-MADE SLOTTING DEVICE end of the equipment. The saw frame is arranged tofit into the lathe tool post, and it is as readily put intoposition as any lathe cutting tool. The power is trans-mitted from the line shaft by a bell cord belt to a smallpulley, which may be clamped or bolted to the lathe bedbase. This pulley is mounted on a slotted shaft in orderto give free longitudinal movement to the slotting universal joints in the shaft permit free angularmovement of the tool post. As shown in the accom-panying illustration, a pair of small beveled gears trans-mit the power to the slotting saw, and the slottingoperation is performed with the armature fixed betweenthe lathe centers. The longitudinal movement of theslotting saw is obtained through means of the tool postcontrol. Portable Furnace Reduces Labor A portable fuel-oil furnace for heating steel bolstersand platform knees preliminary to bending them in abulldozer has greatly reduced
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