The Equiphase Cell maintains the triple point condition as long as the bottom of the
mantle has not melted and provided the mantle is free to rotate.
(2) THE INNER MELT. A very pure ice-water interface surrounding the
thermometer well is formed by melting a thin layer of ice next to the well. This
interface is generally referred to as the "inner melt." The ice mantle itself is
purified to some extent by the freezing process. This results in a higher
concentration of impurities in the water at the outside of the ice mantle with the
purest ice next to the thermometer well.
(a) Lower the small piece of rubber to the bottom of the thermometer well
to prevent bottoming of the thawing rod and thermometers on the glass
(see figure 8).
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