CAUTION: Avoid overfreezing. See para. 2e.
(c) When the ice mantle is frozen, pour out excess dry ice. Melt residues in
the well by adding several cc of alcohol. The alcohol also serves as a heat
transfer medium.
(d) The ice mantle may sometimes melt slightly at the top and recede
below the surface of the water in a short period of time, while the rest of
the ice mantle remains intact. In this event, the triple point temperature is
not degraded significantly. The correction for height is inconsequential,
(see para. 6, (c)(7), and any error introduced by the surface temperature of
the water approximating room temperature may be neglected. (See figure
7)
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