. Railway mechanical engineer . ed although treated lumber has not l>een used inthe construction of cars for a sufficient length of time to de-termine the life which can be secured from treated sills, floor-ing or roofing. The method of treating cross ties and pilingis different from the process used in applying preservatives tocar timbers, and for that reason the life secured from struc-tural timber when treated with preservatives does not indi- l^oards and sub-flooring 1 in. by 4 in. by 5 ft. All thelumber was southern yellow pine, the average grade beingNo. 1 common. The average density
. Railway mechanical engineer . ed although treated lumber has not l>een used inthe construction of cars for a sufficient length of time to de-termine the life which can be secured from treated sills, floor-ing or roofing. The method of treating cross ties and pilingis different from the process used in applying preservatives tocar timbers, and for that reason the life secured from struc-tural timber when treated with preservatives does not indi- l^oards and sub-flooring 1 in. by 4 in. by 5 ft. All thelumber was southern yellow pine, the average grade beingNo. 1 common. The average density was approximately 8annular rings per inch and about JO per cent was summerwood. The lumber was all kiln-dr\ stock and was well sea-soned, the average dry weight being lb. per cu. ft. TREATMENT OF SILLS Seven sills fully framed, with mortises and tenons cutand bolt holes drilled, were taken from stock at random forthe test. The individual sills were numbered and wereweighed both before and after treatment. The preservatives. Fig. 1—Tank in Which Sills Are Treated with Creosote Oil cate the length of service that may reasonably be expectedfrom treated lumber used in car construction. The Marsh Refrigerator Service Company, Milwaukee,Wis., has used the creosote treatment for sills and roofingapplied to refrigerator cars for some time past. In orderto determine the amount of impregnation being secured bythe method of treatment used on these parts and to estimatethe probal)le average life of the treated lumber, this companyrecently conducted a series of tests of the process of creosotingsills aiid roofing. The material creosoted consisted of stand-ard refrigerator car sills 5 in. by 8 in. by 35 ft. and roof used in the treatment ot all the lumber was Carlx)sota, aliquid creosote oil, conforming to United States RailroadAdministration specifications R Sills numbers one toseven inclusive were subjected to a hot treatment for sixhours, being completely submerged in the c
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
