\fdO'^ - Old Forge Coal Mines

306 RAILROAD STRUCTURES.
(1039)
See Art. 1 758 and Fig. 592.
See Art. 1759.
See Art. 1759.
See Art. 1 760.
See Art. 1 760 and Figs. 598 to 601, inclusive.
See Art. 1761 and Fig. 004.
See Art. 1 763 and Figs. 006 and 607.
See Art. 1 767 and Figs. 008, 609, and 610.
See Art. 1770.
See Art. 1775 and Figs. 617 and 618.
See Art. 1778.
See Art. 1780.
See Art. 1787.
See Art. 1789 and Fig. 622.
See Art. 1800. From Table 52, Art. 1802,
we find the constant for cross-breaking center loads for
spruce is 450. Applying formula 127, Art. 1800, we have
10 X 144