ROCKY MOUNTAIN MINE TIMBERS. 



23 



Table 12. — Data on individual crushing tests of air-seasoned round mine props (nominal 

 size, 5-inch top by 6 feet long). 









>>2> 









Diameter. 



sa 



tea 



6fl'3 



0.3 



i — i 



OS 







6 





■2° . 



1 



■3 

 O 









a S 



a 













Species. 







■ass 





Be 



•a 

 o 







■SJS 



3 15 ° 



taoto 

 a a 



3^3 



Remarks. 





CD 

 M 



•2 



.3 

 o 



O MOJ 



be 



a 



S 



a 



P< 



A 

 o 



3 





o 







tf 



a 



<1 



5 



CO 



OS 



frl 



« 



o 



o 



£ 



























1,000 























Lbs. 



Lbs. 



lbs. 









Per 



Z6s. per 

 cu. ft. 





Per 



Per 







per 



per 



per 









ceni. 





cent. 



cent. 



In. 



In. 



sq. in. 



sq. in. 



sq. in. 





L o d g epole 



1 



11.5 



24.58 



51 



21 



55 



4.85 



5.17 



3,910 



3,465 



890 



Grain spiral. 



pine (ship- 



2 



11.4 



24.46 



43 



22 



58 



4.77 



5.57 



3,992 



3,580 



875 



Do. 



ment A). 



3 



11.2 



27.96 



57 



18 



33 



5.17 



5.57 



4,770 



4,190 



1,194 



Do. 





4 



12.3 



24.16 



34 



20 



68 



5.09 



5.57 



3,340 



2,750 



954 



Do. 





5 



11.0 



25.83 



47 



19 



35 



4.77 



5.25 



4,640 



3,580 



1,031 



Do. 



Av'ge. 





11.5 



25.40 



46 



20 



50 



4.93 



5.43 



4,130 



3,513 



993 





Lodgepole 



6 



11.0 



28.14 



43 



26 



42 



4.38 



5.01 



5,100 



4,110 



1,198 



Do. 



pine (ship- 



7 



12.0 



27.72 



45 



26 





5.25 



5.57 



6,340 



4,980 



1,450 





ment B). 



8 



15.9 



23.42 



50 



26 



61 



5.17 



5.49 



4,980 



4,010 



1,135 



Do. 





9 



11.2 



29.52 



45 



20 



37 



4.01 



5.73 



6.190 



4,750 



1,452 



Do. 





10 



11.1 



26.58 



42 



17 



37 



5.25 



5.41 



5,230 



4,240 



1,175 



Do. 



Av'ge. 





12.2 



27.08 



45 



23 



44 



4.81 



5.44 



5,568 



4, 438 



1,282 





Alpine fir... 



1 



12.4 



20.24 



15 



16 





4.30 



5.41 



4,120 



3,165 



890 







2 



12.0 



22.88 



23 



12 





4.46 



5.33 



4,260 



3,875 



1,043 







3 



10.5 



20.38 



16 



9 





4.06 



5.09 



3,910 



3,550 



1,002 



Do. 







11.6 



21.17 



18 



12 





4.27 



5.28 



4,097 



3,530 



978 











Engelmann 



1 



11.7 



27.42 



41 



23 





4.62 



5.97 



5,560 



4,290 



1,321 



Do. 



spruce. 



2 



11.2 



28.10 



25 



13 





5.09 



5.49 



3.280 



2,555 



802 



Do. 





3 



11.0 



23.33 



29 



13 





3.50 



4.62 



3,742 



3,120 



1,021 



Do. 





4 



13.0 



24.00 



43 



22 





3.98 



5.25 



2,990 



2,410 



703 



Crooked. 





5 



13.7 



24.81 



50 



28 





4.30 



4.93 



4,540 



3,850 



1,196 



Grain spiral. 





6 



11.3 



23.86 



31 



20 





4.62 



5.33 



4,710 



3,822 



1,150 







7 



10.9 



21.78 



16 



12 





4.85 



5.49 



4,030 



3,030 



1,098 









11.8 



24.76 



33 



19 





4.42 



5.29 



4,122 



3,297 



1,042 











Douglas fir. . 



1 



11.9 



31.63 



76 



25 



31 



4.30 



4.62 



2,960 



2,340 



873 



Crooked; grain spiral. 





2 



11.5 



32.66 



47 



25 



39 



4.54 



5.39 



5,250 



4,450 



1,322 



Crooked; grain un- 

 usually knotty. 





3 



11.6 



28.98 



65 



28 



39 



4.85 



5.17 



4,580 



3,465 



986 



Crooked; grain spiral. 

 Grain slightly spiral, 





4 



13.7 



28.31 



30 



26 



60 



5.25 



5.41 



5,720 



4,240 



1,324 



























knotty. 





5 



13.0 



26.06 



28 



21 



37 



5.33 



6.05 



4,660 



3,590 



1,151 





Av'ge. 





12.3 



29.53 



49 



25 



41 



4.85 



5.33 



4,634 



3,617 



1,131 





Bristle-cone 



1 



12.5 



29.38 



40 



22 



42 



3.90 



4.54 



4,320 



3,512 



1,023 





pine. 



2 



12.6 



32.01 



45 



19 



49 



3.66 



4.30 



4,390 



3,420 



862 







3 



12.4 



36.46 



42 



20 





3.66 



4.22 



3,042 



2,280 



837 



Crooked; grain spiral. 





4 



12.2 



30.34 



35 



19 



68 



3.18 



4.30 



2,340 



2,013 



628 



Crooked. 





5 



12.2 



25.37 



30 



20 





3.98 



4.85 



3.415 



2,890 



779 





Av'ge. 





12.4 



30.71 



38 



20 







3.68 



4.44 



3,501 



2,823 



826 





Western vel- 



1 



10.5 



21.48 



16 



17 



21 



3.66 



4.80 



3,050 



2,470 



742 





low pine 



2 



11.1 



23.55 



15 



18 



88 



4.30 



4.62 



3,842 



3,310 



852 



Grain spiral. 



(shipment 



3 



11.9 



21.99 



14 



13 



95 



4.06 



4.85 



3,230 



3,625 



1,068 





A). 



4 



11.6 



25.50 



11 



19 



96 



3.50 



4.80 



5,330 



4,780 



1,146 







5 



13.4 



23.69 



15 



12 





4.14 



4.85 



3,370 



2,822 



626 









11.7 



23.24 



14 



16 



75 



3.93 



4.78 



3,764 



3,401 



887 











Western yel- 



6 



11.7 



26.30 



17 



12 





4.93 



5.57 



4,070 



3,250 



976 



Crooked. 



low pine 



7 



11.6 



24.03 



19 



17 





4.70 



5.25 



4,260 



3,690 



863 



Grain spiral. 



(shipment 



8 



13.0 



27.72 



31 



20 





4.93 



5.65 



4,420 



3,350 



1,160 





B). 



9 



11.5 



25.73 



13 



19 





4.93 



5.41 



4,790 



3,770 



1,115 



Do. 





10 



10.9 



23.64 



12 



14 





4.62 



5.33 



3,120 



2,270 



628 



Grain spiral, crooked. 



Av'ge. 





11.7 



25.48 



18 



16 





4.82 



5.44 



4,132 



3,266 



956 





