Cork insulation; a complete illustrated textbook on cork insulation ...

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HISTORY OF REFRIGERATION 327
refrigerating plants, the suggestion having no doubt come
down from the early days of the utilization of snow and ice
found in the summer months in deep rocky crevices and
natural caves of the mountains.
These underground masonry caverns were not insulated,
except naturally by the earth, but their heavy masonry walls,
once cooled, acted as enormous reservoirs of cold. Many of
these storage cellars were constructed in Europe, especially
FIG. ISO.—SAWDUST INSULATED NATURAL ICE HOUSE.
in Germany, and many more of them were built later in the
States, particularly in connection with breweries, in
*the early days when a simpler and cheaper method of guaran-
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summer refrigeration was unknown. However, as
time passed, ice storages and cooling rooms were arranged in
single tier cellars, by locating the cold room within the ice
so to speak, and having less height, so that the ice
could be piled, as harvested, around and over the cold room.
type of cold storage and ice storage combined was
constructed [ by digging a cellar into the side hill and building