A gradual refrigeration proceeded through the Pliocene period.
To produce refrigeration the operation is reversed.
Pie safes and food safes, which were meant to preserve food prior to the invention of refrigeration, were cupboards that often had punched tin inserts in the doors and sides to allow for air circulation, and for a pretty decoration.
The city has a monument (1900) to John Gorrie (1803-1855), a physician who discovered the cold-air process of refrigeration in 1849 (and patented an ice-machine in 1850), as the result of experiments to lower the temperatures of fever patients.
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