. Locomotive engineering : a practical journal of railway motive power and rolling stock . t along on its own merits manyof them were thrown out of service. There are two general types, the oneconsisting of metallic rings which goaround the rod, breaking joints so thatthe steam cannot pass the joints of therings along the rod, and fitting into aconical cup that crowds the rings againstthe rod. This type usually has a strongcoiled spring, which holds the rings in thecup. Steam pressure also tends to crowd of itself till it is completely worn out. likea brake shoe. You will notice when metallic
. Locomotive engineering : a practical journal of railway motive power and rolling stock . t along on its own merits manyof them were thrown out of service. There are two general types, the oneconsisting of metallic rings which goaround the rod, breaking joints so thatthe steam cannot pass the joints of therings along the rod, and fitting into aconical cup that crowds the rings againstthe rod. This type usually has a strongcoiled spring, which holds the rings in thecup. Steam pressure also tends to crowd of itself till it is completely worn out. likea brake shoe. You will notice when metallic rod pack-ing is first adopted on a road where hemphas been exclusively used, that it givesmore or less trouble till the men, both re-pairers and engine men, learn how to takecare of it. The packing needs lubricationbetween the rings and the rod. If the oilcould be introduced into the steam spacenext to the rings and right on the rod, itwould be more effective than when aswab or oil cup is used outside the is needed more when the engine isdrifting with steam shut off than when. ADAMS WIND-SPLITTING TRAIN ON THE BALTIMORE & OHIO RAILROAD—REAR VIEW. pressure engines of Perkins and others■used at that early day, a metal like babbitt■metal was used with very good results. Most of the rod packing at that time■was hemp, which served a good steam pressure was low and the pis-ton speed very moderate, so hemp did not■wear out very fast. As long as the steampressure remained below 120 pounds thetemperature was low enough for hempto last, but as the pressures were raisedfrom year to year, till they got up to 180and 200 pounds in the locomotive service,the limit of endurance for hemp waspassed. Since metallic rod packing was first de-signed inventors have been devising newkinds, till they are as numerous as thevarious kinds of safety car couplers. Eachinventor noted a special defect in somemake of rod packing, and at once set to the rings into the cup. This c
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
