Popular photographic printing processes : a practical guide to printing with gelatino-chloride, artigue, platinotype, carbon, bromide, collodio-chloride, bichromated gum, and other sensitised papers (1898)
rom atmospheric and other moisture, to which end what is known as a calcium tube is generally used. This is constructed somewhat as follows : — Fig. 15 A shows the tube or case, which is made of japanned metal. At B 1 the lid pulls off ; the joint being, when the lid is on, covered by a rubber… … in muslin (C). The Fig. 15. action of the cal¬ cium is to absorb all moisture, for which it has an extra¬ ordinary affinity. Care should be taken that particles of the calcium do not get on to the surface of the paper. The calcium tube is useful for the storage of many other kinds of paper besides…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
