. Electric railway journal . bearings are also madeof brass, but are not lined. The dowel pins for the arm-ature bearing caps are being replaced by keys anchoredin the caps. The axle caps and old dowel-pin holesare being filled by use of the oxyacetylene torch andredrilled and fitted with the case-hardened dowel pins. The commutator and armature bearings are made Iin. longer than they were originally, and a ^-in. grooveis turned on the outer end. A galvanized-iron cap isfitted over the end and is crimped into the groove, thusmaking the bearing practically dustproof. In some cases it has been f
. Electric railway journal . bearings are also madeof brass, but are not lined. The dowel pins for the arm-ature bearing caps are being replaced by keys anchoredin the caps. The axle caps and old dowel-pin holesare being filled by use of the oxyacetylene torch andredrilled and fitted with the case-hardened dowel pins. The commutator and armature bearings are made Iin. longer than they were originally, and a ^-in. grooveis turned on the outer end. A galvanized-iron cap isfitted over the end and is crimped into the groove, thusmaking the bearing practically dustproof. In some cases it has been found necessary to build upthe gear case seats on badly worn shells, also to planeoff the axle and armature bearing caps to insure theirtruing up in the boring. From the boring mill the shell is taken to the truckdepartment, where it is cleaned and painted, and the mo-tor is assembled. The motors which are being reboredhave been in continuous service since 1905 without pre-vious reboring. There are 3000 shells to be MOTOR SHELL READY FOR SIMULTANEOUS REBORING OFFOUR BEARING SEATS September 7, 1918 Transportation Wins Wars No Less than Generals 425 Solid Manganese vs. Manganese-Insert Special Work Supplementing the Authors Article in the Oct. 13,1917, Issue of This Paper—ConclusionsFavor Solid Manganese By W. L. Whitlock Office Engineer the Denver (Col.) Tramway IN JULY, 1910, this company placed a four-square90-deg. crossing at the intersection of Fifteenth andLawrence Streets, which was a portion of the grandunion layout built for this location and exhibited atthe electric railway convention in this city during thatyear. Three of these crossings were manganese insert workwhile the fourth crossing was solid manganese. Themanganese inserts were a source of continual main-tenance while the solid manganese crossing has costpractically nothing to maintain, thus giving an actualcomparison as to the relative value of the two differenttypes of crossings, as both were subjec
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