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DEVELOPMENT OF THE NEGATIVE
ience trouble from slack strands adhering and stopping the action of the developer where they stick together.
If the maker is an amateur metal worker, he may make an apparatus quite a bit more compact by constructing it of square brass rod stock, with smaller brass pins, which on account of their size may be set closer together than the wooden dowels.
A developing tray 21 inches square inside measurement and 4 inches deep will accommodate the diagonal cross arms of the 27-inch rack. The trays may be made of wood, but by getting a sheet metal worker to construct the trays of sheet iron, a
Fig. 36
much lighter and more compact nest of trays may be made. A set of three trays is necessary, one for the developer, one for the Hypo and one for a washing tray. Each of these in succession is just enough larger than the one preceding so that they will nest together for packing.
For those who wish to construct their own trays of wood Figure 36 shows a wooden developing tray which may be constructed of any sort of wood which may be at hand. It is not advisable to try to make this tray water-tight since the action of the water and developing fluids will inevitably warp it so that it would leak too badly to use. Wooden trays are easily rendered water-proof by lining with rubber cloth or in the case of hypo and washing trays, with ordinary table oil cloth. Oil cloth cannot be used in a developing tray unless it is covered with a good coat of Probus paint, as the alkali in the developer dissolves the waterproof coating on the oil cloth.
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