. American engineer and railroad journal . thesteaming process the pores of the timber are opened, thefibers softened, moisture and sap evaporated, and thealbumen coagulated. The duration of the process de-pends upon the seasoning of the timber and the amountof oil to be injected ; it is generally from lo to 12 the live steam is shut off and the vacuum pump isset to work, which withdraws the evaporated moistureand sap and discharges the same in condensed duration of this process Is about six hours ; duringthis time a vacuum of from 20 to 25 in. is produced in thecylinder. N
. American engineer and railroad journal . thesteaming process the pores of the timber are opened, thefibers softened, moisture and sap evaporated, and thealbumen coagulated. The duration of the process de-pends upon the seasoning of the timber and the amountof oil to be injected ; it is generally from lo to 12 the live steam is shut off and the vacuum pump isset to work, which withdraws the evaporated moistureand sap and discharges the same in condensed duration of this process Is about six hours ; duringthis time a vacuum of from 20 to 25 in. is produced in thecylinder. Now the charge is ready for the oil. All the oil used for one charge is taken out of the work-ing tank and is previously heated to about 175°. Theworking tank is a s(|uare iron tank 25 ft. wide, 40 ft. longand 4 ft. deep ; each vertical inch or inch of depth repre-sents 620 United States gallons. To compute the amount of oil required for a charge thefollowing calculation is always made ; the cubic contents 3U THE RAILROAD AND [July, of each creosoting cylinder areknown, also tlie conlenls ot thecharge, being previously measuredand conipuied. liy subtractingthe cubic contents of the chargefrom the cubic contents of the cyl-inder, the difference represents thevacant space in the cylinder—thisamount can be readily ex[)resscdin gallons—the amount of oil tobe injected percubic fool of chargeis known and can also be ex-pressed in gallons, consequentlythe whole amount ol oil to betaken from the working tank tofill the vacant space in the cylinderand to go in the limber is knownin gallons. A float wilh an indicator restsupon ihe oil in the working lank ;the position ot the indicator ismarked on a gauge-board securedto the covering of Ihe workinglank just before the oil is allowedto flow into the creo^oting cylin-der. Then the valves in the pipesconnecting the working lank witheach creosoling cylinder are open-ed and the hot oil is drawn intothe cylinder by means of (hevacuum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
