TABLE OF CURVE-LENGTHS OR ARCS CORRESPONDING TO ANY ANGLE OF DEFLECTION, WHEN R = 1000.

TABLE OF ORDINATES FOR EQUIDISTANT POINTS ON THE
TANGENT (continued). R = 1000.

TABLE OF ORDINATES FOR EQUIDISTANT POINTS ON THE TANGENT (concluded). R= 1000.

The curves usually adopted for centre lines of railways and canals are circular, and it is for these only that the foregoing data for determining a curve are applicable. Other curves that have been occasionally used are the parabola, Gravatt's and Froude's curves, and the compound circular curve of the author; but these will be noticed in a subsequent section.

Ranging a curve or a centre line simply consists in setting out a number of pegs along the proposed curved centre line of the works; sometimes they are placed at