TEMPERATURE.
The influence of temperature on develop ment is considerable, and exercises the same effect as strong and weak solutions both in colour and contrast ; the former corresponding with a high temperature, and the latter with a low one. As far as possible, a temperature of 60° F. should developer, and the right-hand one is also filled with water for rinsing. The exposed prints are placed, one at a time, face clown wards in dish A, with one sweep, so as to avoid air bubbles. The dish B is filled with developer, to the depth of half an inch or so, and into this they are placed face up, one by one. The dish is not to be rocked, but the bottom print is taken each time and laid on the top. In this way they are kept constantly moving and separated in the solution. Au experienced hand will deal with a large number of prints in this way, but possibly about a dozen will be found as many as can be conveniently handled by the novice. The number will to some extent depend upon the concentration of the developer ; as if too rapid, the bottom print will be nearly finished by the time the last one goes in. The dish should be
a size or so larger than the largest print, so that when nearly clone it may be drawn aside and remain in view. When de veloped, the print is at once plunged into dish c for an instant, and then thrown into the hypo. bath n, which is preferably at tended to by an assistant. If this is not possible, the prints in the developer must be manipulated with the right hand, and those in the hypo. bath with the left. This will necesitate arranging the dishes the other way about. In any case the solutions must not get contaminated with each other, and the prints must be kept well separated the whole time. The object of washing them after development and be fore fixing is to avoid stains. if this is not done, dark marks will possibly appear on the finished print ; while if not kept thoroughly under the solution, they are liable to turn brown in those places left un covered.