Page:Popular Science Monthly Volume 39.djvu/34

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24
THE POPULAR SCIENCE MONTHLY.
PSM V39 D034 An ammonia compression ice machine.jpg
Fig. 2.—An Ammonia-compression Ice Machine.

ing to the "compression system," like the ammonia machine just described, necessarily has the same essential parts, though differing somewhat in form and arrangement. It uses a brine made from magnesium chloride instead of common salt.