ROCKY MOUNTAIN MINE TIMBERS. 
21 
Table 11. — Data on individual crushing tests of green round mine props (nominal size, 
5-inch top by 6 feet long). 
t»2 
4 
13 
Diameter. 
6 a 
a a 
si 
i 
fe 
"§&£? 
.a 
g 
*q 
o >> 
i ■ 
Species. 
8 
•S^S 
4> 
Is 
•d 
s?a 
.si 
+2 
Remarks; 
a 
•2 
B 
•a 
o 
ft 
a 
.a 
o> 
I 
1 
6 

1 i 
3 'B 
1 
o 
i 
tf 
H 
< 
« 
OQ 
H 
pq 
o 
o 
a 
1,000 
Lbs. 
Lbs. 
lbs. 
Per 
Lbs. per 
cu.ft. 
Per 
Per 
per 
per 
per 
cent. 
cent. 
cent. 
In. 
In. 
sq. in. 
sq. in. 
sq. in. 
Lodgepole 
1 
63.4 
26.23 
47 
26 
55 
5.17 
5.33 
1,885 
1,620 
587 
Grain slightly spiral. 
Slightly crooked. 
pine (ship- 
ment A). 
2 
85.6 
22.50 
47 
20 
73 
4.93 
5.57 
1,440 
1,049 
559 
3 
64.0 
24.18 
40 
17 
41 
6.13 
6.37 
1,756 
1,356 
652 
Grain slightly spiral. 
4 
99.0 
22.23 
38 
16 
66 
5.65 
5.89 
1,808 
1,595 
343 
5 
48.3 
24.72 
28 
15 
28 
5.89 
6.13 
2,285 
1,981 
839 
5 knots in failure 
plane. 
6 
65.3 
22.79 
43 
1ft 
50 
6.13 
6.92 
1,835 
1,356 
582 
Unusually knottv. 
7 
102.0 
21.48 
56 
20 
54 
5.57 
6.13 
1,820 
1,396 
546 
Grain spiral. 
8 
83.7 
23.46 
32 
13 
62 
5.81 
6.45 
1,745 
1,509 
560 
9 
67.4 
24.22 
32 
14 
65 
5.99 
6.53 
1,800 
1,420 
602 
Do. 
10 
78.4 
25.70 
36 
18 
46 
6.05 
6.45 
2,281 
1,670 
719 
Do. 
Av'ge. 
75.7 
23.75 
40 
18 
54 
5.73 
6.18 
1,865 
1,495 
599 
Lodgepole 
11 
61.8 
24.57 
41 
18 
50 
5.81 
6.13 
1,712 
1,130 
539 
Slightly crooked. 
pine (ship- 
12 
63.3 
23.08 
46 
22 
55 
6.05 
6.84 
1,490 
1,250 
387 
ment B). 
13 
58.7 
26.40 
45 
20 
25 
6.13 
6.53 
1,890 
1,559 
442 
Do. 
14 
81.0 
22.76 
48 
20 
29 
5.65 
6.45 
1,782 
1,354 
468 
15 
57.5 
19.45 
58 
13 
31 
5.25 
6.05 
1,630 
1,292 
598 
Grain spiral. 
1ft 
82.4 
22.86 
38 
15 
58 
5.73 
6.21 
1,705 
1,396 
621 
Do. 
17 
108.2 
24.38 
35 
12 
73 
4.85 
6.21 
1,169 
866 
439 
18 
61.8 
22.21 
44 
16 
53 
5.73 
6.37 
1,655 
1,318 
481 
19 
69.6 
20.56 
31 
12 
50 
6.76 
7.42 
1,438 
891 
526 
Slightly decayed. 
20 
63.7 
22.39 
48 
14 
55 
7.00 
7.56 
1,590 
1,351 
463 
Grain spiral. 
Av'ge. 
70.8 
22.86 
43 
16 
48 
5.90 
6.58 
1,605 
1,240 
496 
Alpine fir. . . 
1 
58.5 
19.44 
23 
12 
5.17 
6.05 
1,770 
1,334 
463 
2 
38.6 
24.07 
42 
15 
5.37 
5.73 
2,355 
1,944 
706 
3 
119.9 
20.03 
32 
18 
4.70 
5.38 
1,712 
1,441 
502 
4 
115.3 
28 
22 
4.90 
5.58 
1,573 
1,378 
401 
Grain slightly spiral. 
5 
86.3 
22.41 
25 
20 
5.00 
5.50 
1,930 
1,630 
547 
Do. 
6 
78.1 
20.28 
13 
14 
4.77 
5.65 
1,870 
1,568 
519 
7 
1-23. 6 
21.58 
23 
16 
4.85 
5.41 
1,978 
1,300 
633 
8 
63.1 
22.82 
20 
10 
4.70 
5.65 
2,007 
1,268 
486 
9 
135.7 
20.22 
29 
9 
4.62 
5.57 
2,082 
1,551 
614 
Av'ge. 
91.0 
21.36 
26 
15 
4.90 
5.65 
1,920 
1,490 
541 
Engelmann 
1 
52.4 
23.32 
32 
13 
5.65 
7.08 
2,040 
1,755 
642 
spruce. 
2 
68.8 
24.14 
46 
18 
6.20 
7.00 
2,000 
1,459 
686 
3 
53.1 
24.08 
38 
14 
5.25 
5.73 
1,875 
1,293 
578 
4 
75.4 
22.98 
25 
16 
4.38 
5.41 
1,511 
1,062 
358 
5 
89.1 
22.82 
25 
20 
4.46 
5.16 
1,515 
1,280 
459 
6 
73.2 
24.20 
19 
14 
4.14 
5.09 
1,590 
1,340 
592 
Crooked. 
7 
72.2 
22.96 
26 
15 
4.77 
5.41 
1,663 
1,230 
518 
Grain spiral. 
8 
53.8 
25.46 
28 
16 
4.62 
5.25 
1,536 
1,192 
422 
Crooked. 
9 
55.8 
23.79 
42 
14 
4.93 
5.41 
1,888 
1,362 
538 
10 
53.3 
27.38 
46 
20 
4.38 
5.49 
2,115 
1,725 
608 
Grain slightly spiral. 
11 
38.1 
23.66 
24 
14 
5.65 
6.76 
1,518 
1,115 
416 
Crooked. 
Av'ge. 
62.3 
24.07 
32 
16 
4.95 
5.80 
1,750 
1,347 
529 
Douglas fir.. 
1 
89.1 
27.34 
20 
26 
68 
4.95 
5.45 
2,622 
2,180 
799 
2 
34.9 
25.22 
40 
24 
14 
5.33 
5.81 
2,870 
2,242 
596 
3 
91.6 
24.29 
23 
22 
52 
5.41 
6.05 
2,715 
2,438 
765 
4 
66.9 
25.33 
38 
14 
42 
5.60 
6.30 
2,200 
1,946 
718 
Grain spiral. 
5 
37.8 
28.57 
61 
24 
19 
4.93 
5.73 
2,358 
1,885 
676 
Do. 
6 
38.2 
27.08 
40 
28 
26 
6.84 
7.16 
2,664 
2,176 
856 
7 
42.9 
27.52 
45 
23 
31 
5.73 
6.45 
2,730 
2,330 
796 
Do. 
8 
34.8 
31.84 
26 
17 
38 
5.01 
5.57 
2,560 
2,030 
718 
9 
30.0 
30.10 
76 
25 
12 
5.89 
6.61 
2,545 
1,908 
789 
Do. 
10 
38.5 
27.77 
17 
28 
70 
5.09 
5.41 
2,560 
2,160 
865 
Do. 
Av'ge. 
50.5 
27.50 
39 
23 
37 
5.48 
6.05 
2,580 
2,130 
758 
