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

thus preserving a constant ratio, and not changing the proportion at each increase or decrease as follows:—

8
8 = 1 inch.

12 inches = 1 foot.

16½ feet = 1 rod.

40 rods = 1 furlong.

8 furlongs = 1 mile.

3 feet = 1 yard.

6 feet = 1 fathom.

B.
ALGEBRAIC FORMULÆ.

As this work may come into the hands of those who are unacquainted with the solution of algebraic problems, it was thought best to give the following:—