Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 732
WHEKIC THE ICE IS MADE. The figure shows the most important parts ofthe artificial-ice plant. The large vat containsstrong brine; brine is used because it can becooled to zero without freezing. Coils of pipe runthrough this brine. The liquid ammonia, whichis kept in a tank under a pressure of 140… … THE BEAR POSTMAN READY FOR THE ROAD. per square inch, is allowed to escape into thepipes. There it evaporates very rapidly, andcools the pipes to a low temperature. The pipesin turn cool the brine surrounding them. When the brine has been cooled to about fif-teen degrees, tanks holding about 400…
Children's literature
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