6 BULLETIN 77, U. S. DEPAETMENT OF AGRICULTURE. 



Table 3. — Summary of bending tests on round mine caps (nominal size, 5-inch top by 

 8 feet long; span, 7 feet; third-point loading). 



GREEN (WATER SOAKED). 



Species, number of tests. 



Moisture. 



Rings 

 per 



Diameter. 









inch. 



Top. 



Butt. 



Per cent. 

 89.3 

 133.3 

 56.7 



43 

 61 

 23 



Inches. 

 5.59 

 5.90 

 5.17 



Inches. 

 6.20 

 6.68 

 5.60 



60.6 

 89.5 

 40.1 



43 

 52 

 31 



5.78 

 6.00 

 5.25 



6.45 



6.75 

 6.00 



99.5 

 147.2 

 57.6 



21 

 36 



8 



4.65 

 5.63 

 4.13 



5.72 

 6.50 

 5.38 



54.3 

 74.6 

 36.3 



30 

 45 



17 



5.16 

 6.00 

 4.44 



6.40 



7.00 

 5.88 



69.4 

 119.1 

 32.6 



27 

 38 

 16 



4.78 

 6.25 

 4.00 



5.66 

 7.00 

 5.00 



74.3 

 96.1 

 66.2 



37 

 62 

 25 



4.63 

 5.63 

 3.38 



5.62 

 7.00 

 4.00 



88.5 



106.3 



71.1 



13 

 15 

 12 



4.39 

 4.80 

 3.75 



5.60 

 6.25 

 4.75 



147.1 

 198.4 

 86.5 



26 

 42 

 15 



4.42 

 5.00 

 3.62 



5.45 

 6.12 

 5.00 



Modulus 



of 

 rupture. 



Fiber 



stress at 



elastic 



limit. 



Stiffness 

 factor 



0&) 



Lodgepole pine (shipment A); 10 

 tests: 



Average 



Maximum 



Minimum. 



Lodgepole pine (shipment B); 10 

 tests: 



Average 



Maximum 



MiriiTTirrm 



Alpine fir; 9 tests: 



Average 



Maximum 



Minimum 



Engelmann spruce; 11 tests: 



Average 



Maximum 



Minim nm 



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 



Minim urn 



Lbs. per 



sq. in. 



5,172 



6,460 



4,040 



4,768 

 6,180 

 3,585 



4,139 

 5,260 

 1,945 



5,308 

 J, 280 

 3,500 



6,568 

 7,310 

 4,840 



4,578 

 5,480 

 3,500 



4,333 

 4,960 

 3,860 



4,897 

 6,190 

 3,320 



Lbs. per 



sq. in. 



3,104 



3,830 



2,635 



2,762 

 3,555 

 2,090 



2,450 

 2,910 

 1,782 



2,709 

 3,665 

 1,991 



3,455 

 4,675 

 2,505 



2,' 459 

 3,960 

 1,666 



2,170 

 2,775 

 1,553 



2,890 

 3,540 

 2,148 



AIR SEASONED. 



Lodgepole pine (shipment A); 5 tests: 



Average 



Maximum 



Minimum 



Lodgepole pine (shipment B) ; 5 tests: 



Average 



Maximum 



Minim tun 



Alpine fir; 5 tests: 



Average 



Maximum 



Minimum 



Engelmann spruce; 5 tests: 



Average 



Maximum 



Minimum 



Douglas fir; 5 tests: 



Average 



Maximum 



Minim um 



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 



11.4 

 11.9 

 10.6 



54 

 72 

 33 



4.76 

 5.09 

 4.54 



5.21 

 5.49 

 5.09 



9,026 

 11,630 

 7,180 



6,600 

 8,640 

 4,790 



11.1 

 11.7 

 10.6 



44 

 47 

 42 



4.84 

 5.41 

 4.54 



5.49 

 5.73 

 5.33 



6,954 

 9,620 

 4,490 



5,962 

 7,290 

 4,230 



11.4 

 12.1 

 10.4 



26 

 37 

 20 



4.22 

 4.62 

 3.66 



5.28 

 5.57 

 5.09 



7,340 

 9,350 

 5,270 



5,460 

 6,600 

 4,320 



10.9 

 11.8 

 8.8 



37 

 45 



27 



4.41 

 5.33 

 3.50 



5.35 



6.05 

 4.62 



8,242 

 9,900 

 6,260 



6,618 

 7,340 

 5,190 



11.8 

 12.3 

 11.4 



23 

 29 



15 



4.30 

 4.77 

 3.82 



5.20 



5.57 

 4.77 



9,232 

 10,960 

 5,790 



6,842 

 7,660 

 5,100 



11.5 

 12.5 

 10.7 



37 

 52 



27 



3.82 



4.22 

 3.50 



4.98 

 5.25 

 4.54 



8,408 

 9,550 

 7,000 



5,684 

 6,700 

 4,120 



10.3 

 10.6 

 9.4 



14 

 15 

 13 



3.58 

 3.66 

 3.50 



4.85 

 5.09 

 4.62 



7,660 

 9,770 

 5,660 



5,770 

 7,730 

 3,870 



10.7 

 11.4 

 10.3 



21 

 26 

 17 



3.90 

 4.22 

 3.58 



5.12 

 5.41 

 4.62 



6,012 

 7,360 

 4,210 



4,938 

 5,830 

 4,220 



