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D.L. Barney, C.J. Mancuso and T.L. Finnerty

An inexpensive controlled freezing system that allows the temperature regime of eight modular sample chambers to be varied independently was constructed. A microcomputer-based data acquisition and control unit controls the freeze-thaw cycle in each of the chambers, as well as recording sample temperatures at desired time intervals. The computer also controls the freeze-thaw cycles in, and records data from, two differential thermal analysis units and records data from an electrical conductivity meter.