in pounds. Extension Compression.

White Pine. 26 12,000 6000 1229
Yellow Pine. 31 12,000 6000 1185
Pitch Pine. 46 12,000 6000 1727
Red Pine. 35 12,000 6000 1527
Virginia Pine. 37 12,000 6000 1456
Spruce. 48 12,000 6000 1036
Tamarack. 26 12,000 6000 907
Canada Balsam. 34 12,000 6000 1123
White Oak. 48 15,000 7500 1743
Red Oak. 41 15,000 7600 1687
Birch. 44 15,000 7000 1928
Ash. 38 16,000 8100 1795
Hickory. 51 15,000 7200 2129
Elm. 45 16,000 8011 1970


The above table is compiled from a much fuller one in Vose's Treatise
on R.R. Construction.


TABLE OF BOLTS AND NUTS CALCULATED FOR A
WORKING STRAIN OF 15,000 LBS. PER
SQUARE INCH OF SECTION.

Diameter. Area. Strength in Weight per Thick's No. thr's
Inches. Sq. inches. Pounds Foot. Square nut. of nut. per inch.

1/2 .19635 2940 0.66 1-1/4 in 3/4 in 12