TESTS OP EOCKY MOUNTAlK WOODS FOR TELEPHONE POLES. 23 



In figure 7 the weight-strength relations are plotted for bending 

 tests on small specimens cut from the tested lodgepole pine poles 

 and for similar specimens taken from other material grown in Colorado 

 and Wyoming, cut green and air seasoned. It will be seen that fire- 

 kiUed lodgepole pine is equal in strength to the Colorado and Wyo- 

 ming material cut green and air seasoned, and that the Montana 

 m.aterial gave higher strength values because it was exceptionally 

 heavy and much above the normal for Colorado-grown timber of 

 which the fire-killed poles were representative. The soundness of 



•S 13000 



^ IIOOO 































































A 



























o 





/ 

























o 



8 



" r^A 



/ 































i/ 























• 



• 



: 



A 



o 



» 























• 





/■ 



^ % 



' • 





















• 



• 



• i* 



'/ 





• ° 





















• 



■ 



°. 



"'J 



^. 



e 



♦ 























D ■ 



'A 







• 

























X 



• 



■ 









• 























o - Hon^iM .cal^::^fl3Mmc■3ea3me(i• 

 ^ - C(Mado'.fiic-/diM' 

 ■ -Cokiiz2do , f///^p'^. sM Sit -d^dnncd 







J 



/ 



• 





• 

































^ 







• 



»■ 























































il 22 23 2') 26 26 27 2d £9 JO Jl J2 JJ M ij 



Dy Wei^ • Poumis pec cuU. 

 Fig. 7.— Weight-strength relations for clear, dry lodgepole pine. 



the sticks cut from the fire-killed material also indicates that such 

 timber has no inherent defect due to having been killed by fire. It 

 seems more reasonable to regard it simply as seasoned wood, and to 

 assume that deterioration due to age or exposure, if present, would 

 be indicated by the same signs of decay that are apparent in any 

 unsound material. 



The relation between the stresses shown by the individual poles 

 and those shown by the minor tests on the material cut from them 

 is presented in figure 8. It should be remembered that the moisture 

 content of the small specimens was only 8 per cent, as compared 

 with an average of about 16 per cent for the poles. The green-cut 



