. Railway master mechanic [microform] . to give perfect freedom to steam generated there-in and will have no tendency to restrict circulation. The two locomotives previously built had drivingwheels of different diameters, 73 and 80 inches, respec-tively, to determine by experience the diameter of driverbest suited to prevailing conditions. It will be observedthat the diameter selected in the new design is JJ inches,or nearly an average between the two. In comparing therespective tractive powers of the old and new design werefer to the locomotive with 80 in. drivers. The tractive effort of the
. Railway master mechanic [microform] . to give perfect freedom to steam generated there-in and will have no tendency to restrict circulation. The two locomotives previously built had drivingwheels of different diameters, 73 and 80 inches, respec-tively, to determine by experience the diameter of driverbest suited to prevailing conditions. It will be observedthat the diameter selected in the new design is JJ inches,or nearly an average between the two. In comparing therespective tractive powers of the old and new design werefer to the locomotive with 80 in. drivers. The tractive effort of the old engine was 31,678 andthat of the later engine 29,920, and tractive efforts by onequarter weight on drivers are 35,425 and 33,777, respec-tively. Comparing adhesive weight with tractive effortgives a ratio of weight on drivers to tractive effort for the old1 and for the new; and comparingtractive effort with heating surface gives a ratio of trac-tive effort to total heating surface of for the oldand for the Heavy Passenger Locomotive,weight is carried over both forward truck and trailingwheels. There are 245 tubes in the new boiler as against328 of the same diameter and length in the older, whileboth boilers are of the same diameter at front. Thesmaller number of tubes reduces the seeming large flueheating surface, which in the last year or two has had atendency to be carried to extreme. By using a %-inchbridge in place of the usual ^-inch, much freer circula-tion is provided for. Further provision for free circu-lation is made by a wide mud ring of five inches allaround the firebox. By reference to the transverse sec- Chicago & Alton comparison of heating surfaces evidences that thetube surface has been reduced 1002 sq. ft., consideringthe firebrick tubes which were used in the older engine;the firebox heating surface is 23 sq. ft. less, yet there isa larger per cent of total heating surface present in thefirebox of the new boiler. The
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Keywords: ., bookcentury1800, bookdecade1890, bookidrailwaymaste, bookyear1895
