The door is made of the same kind of boards held together with
crosspieces, one of which is fastened so as to fit closely to the
floor when the door is hinged, and act as a trap for the light.
The top crosspiece is also fastened within 1 in. of the top of the
door for the same reason.
Light traps are necessary at the sides and top of the door. That
at the hinged side can be as shown at A, Fig. 5, the closing side
as at B, and the top as at C in the same drawing. These are all in
section and are self-explanatory. In hinging the door, three butt
hinges should be used so as to keep the joint close.
The fittings of the room are as shown sectionally in Fig. 6, but
before fixing these it is best to line the room with heavy, brown
wrapping paper, as an additional safeguard against the entrance of
light.
The developing bench is 18 in. wide, and in the middle an opening,
9 by 11 in., is cut, below which is fixed the sink. It is shown in
detail in Fig. 7, and should be zinc lined.
The zinc should not be cut but folded as shown in Fig. 8, so that
it will fit inside the sink. The bench at each side of the sink
should be fluted (Fig.
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