The rungs are 10 inches apart (Fig. 10), centre to centre. The distance may
be increased to a foot, Or even more if weight-saving is an object.
CONSTRUCTION.
Preparing the Sides.--These are cut to exactly the same length, which we
will assume to be 11 feet 6 inches, planed quite smooth and rounded off
slightly at the corners to make handling comfortable. Before marking them
for the rungs it is important that they shall be so arranged that both
incline equally towards a centre line.
Stretch a string tightly three inches above the ground, and lay the sides
of the ladder on edge to right and left of it, their ends level. Adjust the
bottom ends 8-1/2, the top ends 6-1/2 inches from the string, measuring
from the outside. Tack on cross pieces to prevent shifting, and then,
starting from the bottom, make a mark every 10 inches on the outside
corners, to show the position of the tops of the rungs. A piece of the wood
to be used for making the rungs of is laid up to the pairs of marks in
turn, and lines are drawn on both sides of it.
Cutting the Notches.--The work of marking the ends of the notches will be
quickened, and rendered more accurate, if a template (Fig.
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