Fig. 246.
[ CXXXVII]
To Divide an Inclined Plane into Equal Parts—such as a Ladder Placed against a Wall
Divide the vertical EC into the required number of parts, and draw lines from point of sight S through these divisions 1, 2, 3, &c., cutting the line AC at 1, 2, 3, &c. Draw parallels to AB, such as mn, from AC to BD, which will represent the steps of the ladder.
Fig. 247.