. The Street railway journal . FIG. 1.—FIRST SECTION (HALF SIZE) ADOPTED. pitch, with staggered teeth, making 40 in. face. Thesegears have machined joints, the holes are bored andreamed, all bolts are turned to fit the holes tight, theteeth are carefully cut and the parts are bolted togethertransversely. The form and proportions of teeth in thesegears are shown, half size, in Fig. 3, and were suggestedby John Walker, general manager of Fraser & Chalmers,who built the gears, after consultation with J. R. Hill, en-gineer of the Chicago City Railway Company. The. FIG. 2.—SECOND SECTION (HALF SIZE
. The Street railway journal . FIG. 1.—FIRST SECTION (HALF SIZE) ADOPTED. pitch, with staggered teeth, making 40 in. face. Thesegears have machined joints, the holes are bored andreamed, all bolts are turned to fit the holes tight, theteeth are carefully cut and the parts are bolted togethertransversely. The form and proportions of teeth in thesegears are shown, half size, in Fig. 3, and were suggestedby John Walker, general manager of Fraser & Chalmers,who built the gears, after consultation with J. R. Hill, en-gineer of the Chicago City Railway Company. The. FIG. 2.—SECOND SECTION (HALF SIZE). on the crank shaft, with teeth staggered, forming a gear36 in. wide. Two spur gears of 61 teeth, each 18 in. face and 6 , were placed on the line shaft, with teeth staggered,forming a gear 36 in. wide. They were made of castiron, with strong oval arms. The two parts forming thepinion and the two parts forming the gear were eachbolted together at eight different points of the rim. Theform and proportion of the teeth in these gears are shown,half size, in Fig. i. These gears were calculated to trans-mit 1,500 H. p. with safety. After running eighteenmonths, the arms of the large gears broke, compellingtheir removal, and new cast iron gears, each 20 in. 7j^2 in. pitch, with very heavy arms of high section.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
