10) is cut out
of tin. The side AC is 3/8 to 1/2 inch deep. Apply the template to both
faces of the side in turn, with its corner A at the line below the rung,
and DE flush with the upper corner. When all the notches have been marked
cut down the AC line of each with a tenon saw, and chisel along BC till the
wedge-shaped chip is removed. Finish off every notch as neatly as possible,
so that the rungs may make close contact and keep water out.
Preparing the Rungs.--Lay a piece of rung batten across the lowest
notches, the end overhanging the side by a quarter of an inch or so to
allow for the taper of the ladder, and draw your pencil along the angles
which it makes with the sides. Mark the positions of the nail holes. Cut
off the rung at the cross lines; drill the four nail holes on the skew, as
shown in Fig. 10; and round off all the corners. The other rungs are
treated in the same manner, and the sides are then separated, for the
inside top corner and both back corners, which will be handled most, to be
well rounded off and rubbed smooth with glass paper.
Assembling.--Before putting the parts together give them a coating of
paint, as the contact surfaces will not be accessible to the brush
afterwards.
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