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The photographic negative : written as a practical guide to the preparation of sensitive surfaces by the calotype, albumen, collodion, and gelatine processes, on glass and paper, with supplementary chapters on development, etc., etc. (1888)

Burbank, W. H. (William Henry), 1853- · New York : Scovill Manufacturing Co. · leaf 110

An illustration from The photographic negative : written as a practical guide to the preparation of sensitive surfaces by the calotype, albumen, collodion, and gelatine processes, on glass and paper, with supplementary chapters on development, etc., etc., 1888, leaf 110
94 THE PHOTOGRAPHIC NEGATIVE. work well if properly constructed. A very good substitute for it is found in the infants’ food- warmer, to be had of most druggists, which consists essentially of a covered porcelain jar resting in a metallic water-bath, the water in which is heated by means of a… … Fig. 19. It is simply a common steam cooker somewhat modified to adapt it to its new use. A is the hot water receptacle ; B, fit- ting tightly over A, contains the vessel in which the emulsion is placed ; d, d, are two small tin tubes soldered into B, which serve to convert the apparatus into a…

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Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.

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