. Railway mechanical engineer . tensions end of the 1-in. pipe, which is pointed and serves as a one end of the IJ-^-in. pipe is riveted a machined piece whichis bored out and threaded on the inside and turned on the otitsideto fit the feed sleeve of the air motor. The drill extension has aMorse taper shank welded into the end of the 10-in. pipe, andMorse taper socket in one end of the XY^, in. pipe. Through theinner, or 1-in. pipes of both extensions are drilled holes D. Theseare spaced 2 in. apart and are 7/16 in. in diameter. By means ofthem the tool can be extended or shortened,
. Railway mechanical engineer . tensions end of the 1-in. pipe, which is pointed and serves as a one end of the IJ-^-in. pipe is riveted a machined piece whichis bored out and threaded on the inside and turned on the otitsideto fit the feed sleeve of the air motor. The drill extension has aMorse taper shank welded into the end of the 10-in. pipe, andMorse taper socket in one end of the XY^, in. pipe. Through theinner, or 1-in. pipes of both extensions are drilled holes D. Theseare spaced 2 in. apart and are 7/16 in. in diameter. By means ofthem the tool can be extended or shortened, being held in the de-sired position by the insertion of a J^-in. pin through a hole inthe outside pipe and one of the holes in the inside pipe. The holesin the outside pipes of the feed and drill extensions are shown atA and B respectively. A set of three of each of these tools, or six in all, fills all therequirements of drilling operations about a locomotive. Thelengths to be used are shown in Fig. 2, but one length being 579. Fig. 4—Using the Drill Extension in Dri Pilot Heel Plate position. The motor is then set up and final adjustment madewith the feed by turning on the pin .4. Fig. 4 shows one example of the use of the drill extension inthe operation of drilling the heel of a pilot, which is self explana-tory. This set of tools greatly facilitates the work of many drilling 580 RAILWAY AGE GAZETTE. MECHANICAL EDITION Vol, 89, No. 11 operations. Among these may be mentioned: Drilling across theframes; all inside fire box drilling; bumper beam plates; drilhngrunning boards in place; stay holts in throat shoots and holes inheels of pilots for pilot braces. PROTECTION OF IRON AND STEEL General BY J. W. [lan Locomotive Painters, Atciiison, Topelia & Santa Fe,Topelca, Kan. We must have some knowledge of the composition of a ma-terial and of the agencies that commonly enter into its destructionin order properly to protect it. Thorpe, in his Dictionary of-Applied Chemist
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