. American engineer and railroad journal . ement seems to be a pit trackraised on stilts above an incline of concrete with a cinder cartrack at a lower level and beside the pit track, so placed asto render the shoveling easy. All that then remains is to putin enough tracks to permit of passing the engines quickly andto make the tracks long enough so that they will not quicklyclog up with ash and cinder. High cutting speeds are specially interesting when accom-plished on old machines. In an out of the way corner of alocomotive shop, our representative found an old Niles lathe which w
. American engineer and railroad journal . ement seems to be a pit trackraised on stilts above an incline of concrete with a cinder cartrack at a lower level and beside the pit track, so placed asto render the shoveling easy. All that then remains is to putin enough tracks to permit of passing the engines quickly andto make the tracks long enough so that they will not quicklyclog up with ash and cinder. High cutting speeds are specially interesting when accom-plished on old machines. In an out of the way corner of alocomotive shop, our representative found an old Niles lathe which was speeded up to a cutting speed of 51% minute in axle turning. With one of the new tool steels itwas taking a V4-in. cut at %-in. feed at this speed. In thesame shop is a ten-year-old, 42-in boring mill. It is too feebleto carry a heavy cut on large works and is used to bore outdriving boxes. A large box is set, faced and bored in 30 min-utes and the machine does this work very well. The boringal me is often done in eight SECTION A-A. DETAILS OF THE BBACKET I BEB OB THE NOTCHES POSTS fCABBY THE ADJUSTABLE PLATFOBM. Large compound locomotives must be provided with devicesto facilitate drifting without overheating the cylinders. Theyare usually liberally provided with relief bypass and watervalves and these, with the piston rod and valve stem pack-ings, frequently leak and sometimes enough steam escapesto obscure the view of the engineer. It is strange but truethat this difficulty is made the basis of an argument againstthe compound locomotive in general. Such a complaint is asurprising confession of helplessness, but it is often heard andis not confined to any particular type of compound. Thecirculating pipe used so successfully on the Southern Pacificmeets this difficulty perfectly, except as to the leakage of pistonrod and valve stem packing. With piston valves a circulatingdevice is necessary for all cylinders and specially is it neces-sary for large low pre
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
