RACKS.
These also are dealt with in the section on Development (p. 126), as ell as in the first section (p. 20). A few hints will be example, " Pyro. Developer," " Ferrous Oxalate," and so on. This should be done in waterproof varnish or paint, of a colour which will be distinctly visible against its surroundings in the light of the dark-room.
given here on the making of emergency racks for drying negatives when all the ordinary racks are occupied. One method is to drive a series of long nails at inter vals in the wall, where there is any open space. The negatives can then be placed on these, as shown in Fig. 378, the lower corner touching the wall, with the film downward. The nails should be arranged at different distances to suit various sizes of plates. Another way is to make a series of saw-cuts about in. .deep, and 1 in. distant from each other in the upper sur face of any available shelf. There is
nothing to interfere with the ordinary use of the shelf, while in an emergency This permits of negatives being safely placed outside to dry in a current of air, without any risk of attracting dust and grit. It is also a convenient receptacle for negatives which are in the drying stage when it is desired to clean or sweep the dark-room. A drying chamber is almost indispensable for the more delicate opera tions, such as those involved in photo mechanical work. A good pattern is shown by Fig. 331.
the articles on it may be removed and the negatives stood up to dry, by resting them in the saw-cuts, which, of course, should be made wide enough to permit the easy insertion and withdrawal of the negatives. A convenient pattern of folding rack is shown by Figs. 379 and 380.