ROCKY MOUNTAIN MINE TIMBERS. 

























































9000 

















All 



!DR 



ED 













































•- 



DE 



AD 































































































































































i 



GF 



EEN 





















































Dl 



AD- 



WATERSO, IKED 















































































































FIBER 



STf ESS AT ELASTIC LIMIT 





































































































































^Al 



*DR 



ED 























































































































































-P E 



ao 











































s 

























QR 



:em 



























































DE/ 



1D-W 



ITER 



SOAK 



ED 















































































































MC 



DULUS 



OF 



*UP 



TUR 



E 







































































































































AIF 



DRI 



ED 



























































































12 











































































































10 



















"era 



eiT"' 







_^p_ 



:ad 











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s 



) 







































DE« 



D-w; 



ITER 



SOAK 



nr~ 































































ST 



IFFI 



4ES 



r* 



























































































































































































































































































« 



s 













GRE 



in 









































































































AIR 



irie 



5 









1 



)EAD 



■WAT 



ERSC 



AKE 



> 

















































Cl 



•At> 





-•— 

















































\ 



tor 



KT 



JM 



1X1 



<1UK 



LO 



AD 







































































7 









} 









> 







i 



a 







I 



I 







I 



i 







i 



i 





DIAMETER OF BUTT- INCHES 



Fig. 3. — Relation of unit strength of 16-foot round beams to diameter and condition. 

 29206°— 14 2 



