. Experiments in the preservative treatment of red-oak and hard-maple crossties . e twohorns of the rider andthe lowest part of themeniscus, or surface ofthe water in the gaugeglass, in the same plane,parallax was avoided. The gauge glass wasgraduated in footand read to the foot; volume ofthe tank was cubicfeet for each foot indepth. OVEN-DRY WEIGHT. The oven-dry weightof each tie was deter-mined by means of asection approximately 1inch thick cut from The green or wetvolume of each sectionwas determined, and thesection was then driedin an oven and weighed,tie wa
. Experiments in the preservative treatment of red-oak and hard-maple crossties . e twohorns of the rider andthe lowest part of themeniscus, or surface ofthe water in the gaugeglass, in the same plane,parallax was avoided. The gauge glass wasgraduated in footand read to the foot; volume ofthe tank was cubicfeet for each foot indepth. OVEN-DRY WEIGHT. The oven-dry weightof each tie was deter-mined by means of asection approximately 1inch thick cut from The green or wetvolume of each sectionwas determined, and thesection was then driedin an oven and weighed,tie was computed. The volumes of the sections were obtained from the weight of thewater they displaced. The apparatus shown in figure 4 consistsessentially of a vessel of water placed on the weighing platform of abalance and an arm (separate from balance and vessel) by means ofwhich the wood is submerged. The difference in the weight of thevessel before and after the immersion of the section is the weight ofthe water The weighings were made to the nearest one-half Fig. 2.—Apparatus used in determining volumes of ties. From these values the dry weight of the These sections were cut before the volumes of the ties were This weight is supplied by the weight of the disk plus the pressure required to submerge it. 20 PRESERVATIVE TREATMENT OF CROSSTIES. Before making this determination the sections were soaked inwater until they had reached a constant This was done inorder that their volumes might be more nearly comparable to thevolumes of the ties; most of the latter were only partially seasonedwhen their volumes were determined, and when treated had a moisture content usually abovethe point (30 per cent)where any considerableshrinkage takes their volumeshad been determinedthe sections were air-dried in the laboratoryfor several days, thendried in an oven at100° C. until theyshowed no change inweight over a periodof 24 hours, when th
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectwoodpre, bookyear1913
