APPLYING THE PRESERVATIVE SOLUTION.
Fig. 5.
Taking the plate in the left hand by means of the pneumatic holder, incline it as shown in the diagram ([Fig. 5]); then having poured into a perfectly clean measure rather more of the preservative solution than is necessary to cover the plate twice,[B] pour half of it along the upper edge (A B) in such a manner, that a wave of the solution may flow uniformly from one end of the plate to the other; allow this to flow off into the waste pan or sink, and then bring the plate to the horizontal position, and pour on the remainder of the preservative solution, eight times at least, allowing it to flow back into the measure from each corner in succession, in order that the whole plate may be brought uniformly under its influence. The plate is to be again placed on a piece of clean blotting paper (as shown at [Fig. 4]), and its back once more wiped with a fragment of blotting or papier Joseph, in order to remove any of the preservative solution that may have run from the surface to the underside in the previous operation. The plate thus preserved is to be reared on a piece of blotting paper with its face against the wall until dry, and is then to be stowed away in a plate box, perfectly light-tight to await the
[B] A plate, 9 inches by 7, takes about 1 ounce of solution.