ROCKY MOUNTAIN MINE TIMBERS. 5 



Table 2. — Summary of crushing tests on round mine props (nominal size, 5-inch top by 



6 feet long). 



GREEN (WATER SOAKED). 



Species, number of tests. 







Diameter. 





Rings 

 per 







Moisture. 









inch. 



Top. 



Butt. 



Per cent. 

 75.7 

 102.0 

 48.3 



40 

 56 

 28 



Inches. 

 5.73 

 6.13 

 4.93 



Inches. 

 6.18 

 6.92 

 5.33 



70.8 

 108.2 

 57.5 



43 



58 

 31 



5.90 

 7.00 

 4.85 



6.58 

 7.56 

 6.05 



91.0 

 123.6 

 38.6 



26 

 42 

 13 



4.90 

 5.37 

 4.62 



5.65 

 6.05 

 5.38 



62.3 



89.1 

 38.1 



32 

 46 

 19 



4.95 



6.20 

 4.14 



5.80 



7.08 

 5.09 



50.5 

 91.6 

 30.0 



39 

 76 

 17 



5.48 



6.84 

 4.93 



6.05 

 7.16 

 5.41 



85.9 

 109.0 

 56.1 



35 

 43 

 31 



4.58 

 5.33 

 3.98 



5.38 

 6.40 

 4.77 



96.1 

 116.1 

 83.2 



14 

 16 

 13 



4.44 



4.78 

 4.14 



5.20 



5.60 

 4.94 



82.0 

 113.2 

 54.8 



18 

 32 



11 



5.35 

 5.65 

 5.01 



6.00 

 6.17 

 5.73 



Crushing 

 strength 

 at maxi- 

 mum 

 load. 



Crushing 



strength 



at elastic 



limit. 



Modulus 

 of elas- 

 ticity. 



Lodgepolepine fshipment A); lOtests: 



Average 



Maximum. . ., 



Minimum 



Lodgepole pine (shipment B ); 10 tests: 



Maximum 



Minimum 



Alpine fir; 9 tests: 



Maximum 



Minimum 



Engelmann spruce; 11 tests: 



Average 



Maximum 



Minimum 



Douglas fir; 10 tests: 



Average 



Maximum 



Minimum 



Bristle-cone pine; 10 tests: 



Average 



Maximum 



Minimum 



Western yellow pine (shipment A); 10 

 tests: 



Average 



Maximum 



Minimum 



Western yellow pine (shipment B); 

 10 tests: 



Average 



Maximum 



Minimum 



Lbs. per 



sg. in. 



1,865 



2,285 



1,440 



1,605 

 1,890 

 1,169 



1.920 

 2,355 

 1,573 



1,750 

 2,115 

 1,511 



2,580 

 2,870 

 2,200 



1,657 



2,026 

 1,364 



1,475 

 1,681 

 1,269 



1,940 

 2,410 

 1,668 



Lbs. per 



sq. in. 



1,495 



1,981 



1,049 



1,240 

 1,559 



1.490 

 1,944 

 1,268 



1,347 



1,755 

 1,062 



2,130 

 2,438 

 1,885 



1,310 



1,590 

 965 



1,201 

 1,412 

 1,038 



1,450 

 1,883 

 1,132 



1,000 lbs. 



per sq. in. 

 599 

 839 

 343 



496 

 621 

 387 



541 

 706 

 401 



529 



686 

 358 



758 

 865 

 596 



508 

 638 

 390 



443 

 516 

 345 



561 

 762 



448 



AIR SEASONED. 



Lodgepole pine (shipment A); 5 tests 



Average 



Maximum 



Minimum 



Lodgepolepine (shipmen' B); 5 tests 



Average 



Maximum 



M inimu m 



Alpine fir; 3 tests: 



Average 



Maximum 



Minimum 



Engelmann spruce; 7 tests: 



Average 



Maximum 



Minimum 



Douglas fir; 5 tests: 



Average 



Maximum 



Minimum 



Bristle-cone pine; 5 tests: 



Average 



Maximum 



Minimum 



Western yellow pine (shipment A) 

 5 tests: 



Average 



Maximum 



' Minimum 



Western yellow pine (shipment B) 

 5 tests: 



Average 



Maximum 



Minimum 



11.5 

 12.3 

 11.0 



46 

 57 

 34 



4.93 

 5.17 

 4.77 



5.43 



5.57 

 5.17 



4,130 

 4,770 

 3,340 



3,513 

 4,190 

 2,750 



12.2 

 15.9 

 11.0 



45 

 50 

 42 



4.81 

 5.25 

 4.01 



5.44 

 5.73 

 5.01 



5,568 

 6,340 

 4,980 



4,438 

 4,980 

 4,010 



11.6 

 12.4 

 10.5 



18 

 23 



15 



4.27 



4.46 

 4.06 



5.28 

 5.41 

 5.09 



4,097 

 4,260 

 3,910 



3,530 

 3,875 

 3,165 



11.8 

 13.7 

 10.9 



33 

 50 

 16 



4.42 



5.09 

 3.50 



5.29 

 5.97 

 4.62 



4,122 

 5,560 

 2,990 



3,297 

 4,290 

 2,410 



12.3 



13.7 

 11.5 



49 

 76 

 28 



4.85 

 5.33 

 4.30 



5.33 



6.05 

 4.62 



4,634 

 5,720 

 2,960 



3,617 

 4,450 

 2,340 



12.4 

 12.6 

 12.2 



38 

 45 

 30 



3.68 

 3.98 

 3.18 



4.44 



4.85 

 4.22 



3,501 

 4,390 

 2,340 



2,823 

 3,512 

 2,013 



11.7 

 13.4 

 10.5 



14 

 16 

 11 



3.93 

 4.30 

 3.50 



4.78 

 4.85 

 4.62 



3,764 

 5,330 

 3,050 



3,401 

 4,780 

 2,470 



11.7 

 13.0 

 10.9 



18 

 31 

 12 



4.82 

 4.93 

 4.62 



5.44 

 5.65 

 5.25 



4,132 

 4,790 

 3,120 



3,266 

 3,770 

 2,270 



993 



1,194 



875 



1,282 

 1,452 

 1,135 



978 



1,043 

 890 



1,042 



1,321 



703 



1,131 



1,324 



873 



826 



1,023 



887 



1,146 



626 



956 



1,160 



628 



