. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . close and still have crosshead quite free. One large railroad does not allow its en-gine house to close guides, but whenthere is too much lost motion betweenguides and crosshead gibs, it removes the that there was no certainty of its beingheld in position tightly. On the alligatortype of crosshead, the bottom guide canbe oiled nicely by drilling suitable open-ing in centre of bottom shoe, under thecrosshead pin, as quite an amount of oilwill drop from front end of main rod. .Vftcr guides are
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . close and still have crosshead quite free. One large railroad does not allow its en-gine house to close guides, but whenthere is too much lost motion betweenguides and crosshead gibs, it removes the that there was no certainty of its beingheld in position tightly. On the alligatortype of crosshead, the bottom guide canbe oiled nicely by drilling suitable open-ing in centre of bottom shoe, under thecrosshead pin, as quite an amount of oilwill drop from front end of main rod. .Vftcr guides are lined and bolted, thepiston should be put in cylinder and pis-ton rod keyed in crosshead, front cylinderhead put up and the striking points locatedclearly on guides. By measuring thestroke by these marks, it can be foundwhether there will be sufficient clearancein cylinders to avoid danger of breakingthe heads in service. While clearancespaces are a detriment when steam distri-bution is considered, because the greaterthe clearance spaces the greater the con-densation and the more the loss from ex-. CIIIC.\GO & .\LTON 462 WITH Ii.\KERPILLI011 \AL\Ii and give a general outline of their import-ance in shop work. The rods, guides,crossheads, pistons are stripped by the menin the stripping gang, who are usuallyclassed as machinist helpers. After theparts have been cleaned, the first detail toreceive attention is the cylinder, the ma-chinist having charge of this work ex-amining the cylinder for cracks and calip-eririg the bore to determine if boring outis required. This also refers to the valvechamber bushings where piston valves areused. By doing this work as soon asengine is stripped, gives the machine shopforeman plenty of time to turn up newpistons and division rings for the pistonvalves. This being taken care of. jointsfaced, if necessary, studs applied and backcylinder heads put up, the next step is tohang the guides. In order to insure piston head and cross-head work
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