. Cross tie forms and rail fastenings with special reference to treated timbers . =r=3 o V cm J \ Fig. 39.—Screw-spike in use onthe Bavarian state railways. Fig. 40.—Screw-spike now iiuse on the Italian railways. 46 CROSS-TIE FORMS AND RAIL FASTENINGS. ent screw-spike, or an increase of square centimeters ( inch). The resistance to a vertical pull will increase, therefore, by 335,or 767 kilograms (1, pounds). That is, instead of 5,500 kilo-grams (12,125 pounds), we would have a resistance of 6,267 kilograms(13, pounds), which is about equivalent to the tensile
. Cross tie forms and rail fastenings with special reference to treated timbers . =r=3 o V cm J \ Fig. 39.—Screw-spike in use onthe Bavarian state railways. Fig. 40.—Screw-spike now iiuse on the Italian railways. 46 CROSS-TIE FORMS AND RAIL FASTENINGS. ent screw-spike, or an increase of square centimeters ( inch). The resistance to a vertical pull will increase, therefore, by 335,or 767 kilograms (1, pounds). That is, instead of 5,500 kilo-grams (12,125 pounds), we would have a resistance of 6,267 kilograms(13, pounds), which is about equivalent to the tensile strengthof the core of the screw-spike. If instead of hard wood ties such as oak or beech, soft wood tiessuch as northern fir, were to be used, it would be necessary to stillfurther increase the projection of the thread at the expense of thediameter of the core, taking as a basis the coefficient of resistance tocompression for soft woods. It would, therefore, be desirable toincrease a little the projection of the thread of the screw-spike usedby the Paris-Lyon
Size: 871px × 2870px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectwoodpre, bookyear1904
