This table should be a large slab of marble or slate with a
perfectly plain and level surface; before using it should be cooled
by placing ice or a refrigerating solution on it. The coated plates
are laid on this level table, where the cold soon chills the
emulsion, causing it to set, when they may be set up in racks and
placed in the drying room or box, where in the course of a few
hours, if the conditions are favorable, they will dry and are then
ready for use.