TESTS OF EOCKY MOUNTAIN WOODS FOR TELEPHONE POLES. 15 
POLES. 
Table 1 gives the test data for individual poles. 
Table 2 gives the maximum load of each pole in terms of both the 
equivalent pull at the top and the actual load obtained in the testing 
machine at the ground line. This table is of value chiefly hi com- 
paring the results of these tests with those from other methods of 
applying the load, as all may be reduced to the reaction at the top 
support for poles of the same size. 
Table 3 gives a summary and comparison of the average results 
obtained in the tests on the four classes of poles, based on the western 
red cedar as 100. On a basis of fiber stress developed it will be 
seen that — 
1. Air-seasoned lodgepole pine is superior to western red cedar in 
all the mechanical properties determined. 
2. Fire-killed lodgepole pine is only 80 per cent as strong as western 
red cedar at maximum load. In elastic values, however — that is, the 
fiber stress at elastic limit and the work absorbed up to this point — 
they are practically equal. In stiffness the fire-killed lodgepole pine 
is quite comparable to the cedar, although the latter proved to be a 
more flexible wood. 
3. Fire-killed Engelmann spruce was inferior in all mechanical 
properties to the cedar and pine. 
Table 2. — Top and ground-line loads required to break poles. 
Western red cedar, 
cut green and air 
seasoned. 
Lodgepole pine, 
cut green and air 
seasoned. 
Lodgepole pine fire 
killed 10 years. 
Engelmann spruce 
fire killed 10 
years. 
Pole No. 
Top reac- 
tion at 
maxi- 
mum 
load. 
Maxi- 
mum 
load at 
ground 
line. 
Top reac- 
tion at 
maxi- 
mum 
load. 
Maxi- 
mum 
load at 
ground 
line. 
Top reac- 
tion at 
maxi- 
mum 
load. 
Maxi- 
mum 
load at 
ground 
line. 
Top reac- 
tion at 
maxi- 
mum 
load. 
Maxi- 
mum 
load at 
ground 
line. 
1 
Pounds. 
2,020 
1,705 
2,238 
2,075 
1,745 
2,070 
2,090 
1,782 
1,762 
2,320 
1,473 
2,948 
2,360 
1,768 
2,175 
1,854 
2,244 
2,005 
1,935 
2,440 
Pounds. 
11,600 
9,800 
12,870 
11,920 
10,030 
11,900 
12,000 
10,250 
10, 130 
13,320 
8,470 
16,940 
13,580 
10, 170 
12, 500 
10,650 
12, 900 
11,530 
11. 120 
14,030 
Pounds. 
2,185 
1,770 
1,866 
2,740 
1,913 
2,182 
1,975 
2,828 
2,219 
1,938 
2,226 
2,463 
2,638 
1,928 
2,116 
3,050 
1,854 
2,635 
2,395 
2,445 
2,148 
1,991 
Pounds. 
12, 580 
10, 190 
10, 720 
15, 730 
11,000 
12,540 
11,350 
16, 240 
12, 750 
11,130 
12,800 
14, 180 
15,150 
11,080 
12, 170 
17,520 
10, 650 
15, 130 
13,770 
14,050 
12,340 
11,450 
Pounds. 
714 
Pounds. 
4, 110 
Pounds. 
1,811 
1,980 
1,431 
1,262 
1,094 
2,053 
2,105 
2,652 
1,205 
1,963 
1,900 
2,270 
1,810 
1,515 
2,640 
1,449 
1,726 
731 
2,058 
1,850 
Pounds. 
10 410 
2 
11 390 
3 
1,094 
1,980 
2,000 
1,852 
2,370 
1,762 
1,854 
1,873 
2,118 
2,840 
2,270 
2,526 
1,267 
2,220 
1,377 
1,412 
1,369 
1,822 
6,290 
11,380 
11,500 
10, 650 
13,620 
10, 130 
10,650 
10, 780 
12, 180 
16,320 
13,070 
14, 520 
7,280 
12,780 
7,910 
8,120 
7,870 
10.480 
8,230 
7 260 
4 
6,290 
11 800 
6 
7 
12, 100 
8 
15, 250 
6,930 
11.290 
.9 
10 
11 
10,920 
13,050 
10 400 
12 
13 
14 
8,710 
15, 190 
15 
16 
8,330 
9,920 
4 210 
17 
18 
19 
11,820 
10,620 
20 
21 
22 
Average 
Maximum 
Minimum 
2,050 
2,948 
1,473 
11,785 
16,940 
8,470 
2,250 
3,050 
1,770 
12,930 
17, 520 
10, 190 
1,830 
2.840 
'714 
10,510 
16, 320 
4,110 
1,775 
2,652 
731 
10,210 
15,250 
4,210 
