In setting out the sides for a step ladder, first set up the vertical height C B (Fig. 1) to a convenient scale, and divide for the number of steps required (the usual distances, as shown at F, Fig. 3, being from 7 in. to 9 in.).

Next set off the splay AB (Fig. 1). Join A to C; this will be the pitch of the sides. Draw a horizontal line and set a bevel to this and the pitch line as shown at K (Fig. 1). Now draw a horizontal line DE, then AE will be the distance apart of the treads measured along the edge of the strings (sides). Set a pair of compasses to this distance, and step them along as near as possible to the outer edge of the string and mark off with bevel as shown at Fig. 2. Fig. 3 shows the usual section of steps which are often wedged into the housing of the string as indicated at W. This would have to be allowed for as shown at i, 5 (Fig. 2).

Setting Out the Sides of a Step Ladder.