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. 
Lodgepolepine ('shipment A); 10 tests: 
Average 
Maximum 
Minimum 
Lodgepole pine (shipment B); 10 tests: 
Average 
Maximum 
Minimum 
Alpine fir; 9 tests: 
Average 
Maximum 
Minimum 
Engelmann spruce; 11 tests: 
Average 
Maximum 
Minimum 
Douglas fir; 10 tests: 
Average 
Maximum 
Minimum 
Bristle-cone pine; 10 tests: 
A verage 
Maximum 
Minimum 
Western yellow pine (shipment A); 10 
tests: 
Average 
Maximum 
Minimum 1 
Western yellow pine (shipment B); 
10 tests: 
Average 
Maximum 
Minimum 
Rings 
per 
inch. 
Diameter. 
Crushing 
strength 
at maxi- 
mum 
load. 
Crushing 
strength 
at elastic 
limit. 
Moisture. 
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 
Lbs. per 
sq. in. 
1,865 
2,285 
1,440 
Lbs. per 
sq. in. 
1,495 
1,981 
1.049 
70.8 
108.2 
57.5 
43 
58 
31 
5.90 
7.00 
4.85 
6.58 
7.56 
6.05 
1,605 
1,890 
1,169 
1,240 
1,559 
866 
91.0 
123. 6 
38.6 
26 
42 
13 
4.90 
5.37 
4.62 
5.65 
6.05 
5.38 
1.920 
2,355 
1.573 
1.490 
1,944 
1,268 
62.3 
89.1 
38.1 
32 
46 
19 
4.95 
6.20 
4.14 
5.80 
7.08 
5.09 
1,750 
2,115 
1,511 
1,347 
1,755 
1,062 
50.5 
91.6 
30.0 
39 
76 
17 
.5.48 
6.84 
4.93 
6.05 
7.16 
5.41 
2,580 
2,870 
2,200 
2,130 
2,438 
1,885 
85.9 
109.0 
56.1 
35 
43 
31 
4.58 
5.33 
3.98 
5.38 
6.40 
4.77 
1,657 
2,026 
1,364 
1,310 
1,590 
965 
96.1 
116.1 
83.2 
14 
16 
13 
4.44 
4.78 
4.14 
5.20 
5.60 
4.94 
1,475 
1,681 
1,269 
1,201 
1.412 
1,038 
82.0 
113.2 
54.8 
18 
32 
11 
5.35 
5.65 
5.01 
6.00 
6.17 
5.73 
1,940 
2,410 
1.668 
1.450 
1,883 
1,132 
Modulus 
of elas- 
ticitv. 
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 
AIR SEASONED. 
Lodgepole pine (shipment A); 5 tests: 
Average 
Maximum 
Minimum 
Lodgepolepine (shipmen B); 5 tests: 
Average 
Maximum 
Minimum 
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 
M inim um 
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 
18 
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 
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 
