Handbook of Railroad Construction; For the use of American engineers. / Containing the necessary rules, tables, and formulæ for the location, construction, equipment, and management of railroads, as built in the United States.

by George L. Vose

211. In figs. 92 to 100, are given several plans for spans from five to seventy-five feet. Fig. 92, shows the simple beam braced beneath with diagonal plank; the bolts passing through the ties, stringers, and braces. The stringers are bolted to the wall plates, and when the bridge is upon a curve notched also, by cutting the bolster. Fig. 92 A shows the plan. This form answers for openings from five to twenty feet. From fifteen to thirty feet, we may use figs. 94, 95, 96, and 97. From twenty-five, to fifty and sixty feet, figs. 93, 97, and 98. And from fifty to seventy-five feet, figs. 99 and 100.

The following tables give reliable dimensions for bridges upon the above plans.

Fig. 92. 5 to 20 feet.

Fig. 92 A.

Span.	Bolsters.	Stringers.	Ties.	Braces.	Bolts.
5	12 × 12	12 × 12	6 × 10	2 × 10	1 inch
10	12 × 12	12 × 13	6 × 10	2 × 10	1 inch
15	14 × 14	12 × 18	6 × 10	2 × 10	1 inch
20	14 × 14	12 × 24	6 × 10	2 × 10	1 inch

The ties being notched three inches on to the stringers, without cutting the latter.

Fig. 95. 15 to 30 feet.

Span.	Rise.	Bolster.	Stringer.	Braces.	Rod.
15	6	12 × 12	12 × 12	2—5 × 6	1 inch
20	7	14 × 14	12 × 12	2—5 × 8	1¼ inch
25	8	14 × 14	12 × 15	2—5 × 9	1⅜ inch
30	10	15 × 15	12 × 18	2—5 × 10	1½ inch