This section is from the book "Complete Self-Instructing Library Of Practical Photography", by J. B. Schriever. Also available from Amazon: Complete Self-Instructing Library Of Practical Photography.
Developing Light. The developing light is constructed so that the front is bevel shaped, for in this way it throws the light downward upon the developing tray. The front of this light has two sliding windows, one containing ruby glass and a sheet of P. O. paper, while the other frame is fitted with ground-glass. During development the ground-glass may be shoved back out of the way and the ruby light used, but when development is completed the ruby light frame can be slid back and the ground-glass frame drawn over in its place and the negative examined by it.
Shelving. A very important item in any dark room is the proper arrangement of the shelves. These should be placed in convenient location and each shelf contain certain articles. For instance, the shelves over the developing sink should contain the developing solutions and other bottles, graduates, trays, etc., while the shelving at the end of the room where gaslight prints, bromide enlargements, etc., are made, should be reserved for paper and negatives and those over the changing light for storing dry plates, plate holders, etc. Always keep the same material on the same shelf and in exactly the same location so that when you have formulated this system you will be able to locate any material that you might desire, even though the room is in total darkness.
Department Of Printing And Developing. On the right hand side of the vestibule is another large sink over which is placed a ruby light similar to the one previously mentioned. The glass in front of this light is, however, of an orange color suitable for developing papers, but the window is fitted in a similar manner to the front of the negative developing light, so that white light may be admitted when desired. The developing is done at the left end of this sink, while at the right hand, in the corner, is placed a large hypo tray 25 x 30 inches in size. This tray is large enough to hold prints 20x24 inches and may be used for fixing bromide enlargements as well as velox and other developing papers. Across the narrow end of this room is placed a table three feet deep. Near the center, and far enough away from the developing sink, is a thirty-two candle power incandescent electric bulb, which is operated with a switch and is used for printing gaslight papers. A tin reflector is placed directly over the electric bulb. Directly over this light near the ceiling is a ventilating window which may be opened when the dark room is not in use m order to allow a thorough change in the atmosphere of the dark room.
Enlarging Department. The side of the room opposite the developing sinks and the vestibule is shown in illustration No. 6. This side is shelved and used for storing dry plates, negatives, etc. It is also used for making bromide and negative enlargements. Directly opposite the vestibule entrance and over the drop-table, is a changing light. Underneath this light the plate holders are loaded and unloaded. The light falls directly upon the plate holder, thus enabling one to see sufficiently to load and dust the plates. At one side of the ruby light, under the upper shelf, is a storage box for 5x7 or cabinet size exposed plates. On the front of this box is a heavy lid attached at the top with a heavy spring hinge, which keeps the lid closed tightly after placing the exposed plates in the box In order to facilitate the loading of plate holders, to the right on the changing shelf are two boxes containing dry plates (taken from their original pasteboard boxes), ready to be placed in the plate holders - one box is for 5x7 and the other for 8x10 plates.
Illustration No. 6 Section of Dark Room Used for Bromide and Negative Enlarging See Paragraph No. 20.