THE PHOTOGRAPHIC ROOM
Fig. 14—Halden's Double-pattern. Single-lamp Type Continuous Electric Photo Copying Machine
down in a few moments to the receiving trough underneath. A considerable
number of photographs may be taken off before the washing process is begun.
Often the photographic room is placed high up in the building, a relic of
the time when sun printing was the common practice. This is often respon-
sible for an insufficient supply of water. The bath should be kept perfectly
clean, as considerable sediment comes off some of the photo papers. Indeed,