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Manual of recommended practice for railway engineering and maintenance of way (1905)
American Railway Engineering and Maintenance-of-Way Association · Chicago, Ill. : The Association · leaf 88
Fig. 4.—Rotten Knot. WOODEN BRIDGES AND TRESTLES. K^^\ ^W^^^K -s ^y* FiG. 5.—Pine Knot. … Fig. 6.—Standard Knot. 78 WOODEN BRIDGES AND TRESTLES. Fig. 7.—Large Knot. Fjg. 8.—Spike KnotRailroad engineering · Railroads
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