. Railway mechanical engineer . olds a slider that can be clampedat any position along the side. The outside straight edge ofthe slider is parallel to the oppx)site side of the plate. Bymoving the slider, the distance between these parallel edgescan be varied over a wide range. In using the gage, it is inserted in the hole as shown, theslider being moved along the edge until the gage fits thehole. The slider is then clamped and the gage rotated tosee whether the hole is round and not tapered. If any ir-regularity is found, the hole is ground on an internalplanetary grinder. If the hole is true
. Railway mechanical engineer . olds a slider that can be clampedat any position along the side. The outside straight edge ofthe slider is parallel to the oppx)site side of the plate. Bymoving the slider, the distance between these parallel edgescan be varied over a wide range. In using the gage, it is inserted in the hole as shown, theslider being moved along the edge until the gage fits thehole. The slider is then clamped and the gage rotated tosee whether the hole is round and not tapered. If any ir-regularity is found, the hole is ground on an internalplanetary grinder. If the hole is true, the diameter is meas-ured with a micrometer as shown in Fig. 6, or the slidermay be clamped and the dimension taken after the gage isremoved from the hole. A similar tool which has themicrometer permanently attached is shown in Figs. 7 and 8,being used principally when measuring holes at a distancefrom the machines where the bushings are ground. In thiscase the inspector reads and makes a memorandum of thesizes. K t^T-M^i i .. 7^ >^ secJioHA-* Fig. 8—AMembled View and Details of Special Micrometer Gage Furnace Atmospheres and the Formation of Scale A Study of the Rclatiun of Scale Formation toCarbon Content of Steel and Furnace Atmosphere By G. C. McCormick \>i-lanl Mt■tullu^f{i^t, Cronipton & Kiinwlcs Loom Wurks U orceater, Mass. AN important chemical propertj- of metallic iron is itstendency to combine with oxygen. Under favorableconditions of atmosf)heric humidity and temperature,rust, a compound of iron and , forms with .*pecd andfacility. At the higher temperatures, commonly encountered inforging and heat treating, the activity of these two elements isgreatly accelerated with tlie result tliat a comjjound very dif-ferent from iron rust is formed. Tliis conijiuund is generallyknown as scale. The chemical composition of scale is variableand complex. It is sufticient for this discussion to bear inmind the signficant fact that scale is a compound of iron nnd
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
