. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . then1-16 of an inch is enough. Leaks alsooccur if die piston is much worn. Taper-ing and shouldering of the piston is in-evitable, and a departure of 1-32 of aninch at any part of the piston from theexact truth will cause a considerableleak. It should always be rememberedthat neither the packing or the piston willendure forever. Much time and wasteof steam will be saved by trueing up therods and renewing the packing. Thisprecaution with good lubrication will in-sure tight packing. The rings s
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . then1-16 of an inch is enough. Leaks alsooccur if die piston is much worn. Taper-ing and shouldering of the piston is in-evitable, and a departure of 1-32 of aninch at any part of the piston from theexact truth will cause a considerableleak. It should always be rememberedthat neither the packing or the piston willendure forever. Much time and wasteof steam will be saved by trueing up therods and renewing the packing. Thisprecaution with good lubrication will in-sure tight packing. The rings should be machined all three rings should be faced sepa-rately, and the outside ring should con-form exactly to the vibrating cup. Therings should be sawed apart with a 1-16inch saw. On no occasion should onenew ring be placed with other older andworn rings. They can never be made tofit properly. It should be noted that theyfit exactly ii the rod. Leaks also occur byforeign matter getting in the joints, andfrequent cleaning is necessary, and pos-sibly a refitting of the joints. The nearer. KING TYPE METALLIC VALVE STEMPACKING. the exact center the rod is the better willthe result be. This is especially true ofthe valve rod, which in the case of slidevalves, has a tendency to fall repidly be-low the center, and should be kept inplace by the use of liners under the valveyoke. The joints in the rings should beseparated when placed in the vibratingcup, and a leak should never be allowedto continue until a more convenient sea-son. The loss by packing leaks is ex-actly the same as if a stream of coal andanother of water were continually run-ning out of the coal box and tank withthis difference that the loss is lost for-ever. March, 1918 RAILWAY AND LOCOMOTIVE ENGINEERING 93 Electrical Department The Automatic Railway Sub-Station—No Voltage Release Connections—Track Circuiting on Electrified Railroads Last month we took up the rotaryconverter and explained the design andco
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