. Railway master mechanic [microform] . the minimumweights allowed in interchangeshould be 585, 635 and 685pounds for the three classes cfwheels. The following specifi-cations in connection with draw-ings Nos. 1, 2 and 3 will consti-tute the report. SPECIFICATIONS. For 3 3-inch Cast-iron Wheels Weighing 600, 650 and 700 Cars of 60,000, 80,000 and100,000 Pounds Capacity. 1. Chills must have the sameinside profile as shown by M. O-B. drawings of wheel tread. Theinside diameter of chill must bethe M. C. B. standard of 33*4inches, measured at a point 2inches from outside of tread ofwhee
. Railway master mechanic [microform] . the minimumweights allowed in interchangeshould be 585, 635 and 685pounds for the three classes cfwheels. The following specifi-cations in connection with draw-ings Nos. 1, 2 and 3 will consti-tute the report. SPECIFICATIONS. For 3 3-inch Cast-iron Wheels Weighing 600, 650 and 700 Cars of 60,000, 80,000 and100,000 Pounds Capacity. 1. Chills must have the sameinside profile as shown by M. O-B. drawings of wheel tread. Theinside diameter of chill must bethe M. C. B. standard of 33*4inches, measured at a point 2inches from outside of tread ofwheel. 2. Wheels of the same normaldiameter not vary morethan one-fourth ( % ) of an inchabove or below the main sizemeasured on the circumference,and the same inch in body of the wheel must and free from slag,shrinkage or blowholes. Thetread must be free from deepand irregular wrinkles, slag,chill cracks and sweat or beadsin throat, and swollen rims. 3. The wheels must show July, 1904. RAILWAY MASTER MECHANIC. 283 Plate Design 33-iN. 600-600-700-LB. Cast IronWheels. clean gray iron in the plates,except at chaplets, where mot-tling to not more than one-half (i/o) inch from same willbe permitted. The depth ofpure white iron must not exceedone (1) inch nor be less thanone-half ( y% ) inch in the middleof the tread, and shall not beless than three-eighths (%)inch in the throat, for wheelsweighing six hundred (600)pounds. It shall not exceedone (1) inch in the middle ofthe tread nor be less than seven-sixteenths (7-16) inch in thethroat for wheels weighing sixhundred and fifty (650) pounds,and shall not exceed one (1)inch in the tread or be less thanone-half ( % ) inch in the throatfor wheels weighing seven hun-dred (700) pounds. The depthof white iron shall not varymore than one-fourth (%) ofan inch around the tread on therail line in the same wheel. 4. For each hundred wheelswhich pass inspection and areready for shipment, two repre-sentative w
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