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. When the paint has dried, lay the sides out as before, and nail
on the rungs with 3-inch nails. To counteract any tendency of the sides to
draw apart, a light cross bar should be fixed on the back of the ladder
behind the top and bottom rungs.

Round off the end angles of the rungs, and apply a second coating of paint.

Note.--A ladder of this kind is given a more presentable appearance if
the rungs are let in square to the sides and flush, but at the sacrifice
either of strength or lightness, unless narrow rungs of a hard wood, such
as oak, be used. Moreover, square notches are not so easy to cut out as
triangular.

For a short ladder, not more than 9 feet long, the section of the sides may
safely be reduced to 2-3/4 by 1 inch (actual), if good material is
selected.



V. A DEVELOPING SINK.

Many amateur photographers are obliged to do their developing in odd
corners and under conditions which render the hobby somewhat irksome if a
large number of plates have to be treated. The main difficulty is to secure
an adequate water supply and to dispose of the waste water. At a small
expenditure of money and energy it is easy, however, to rig up a