fractionator. But while the Hempel head possesses the advantage ofa considerable heat inertia, and also satisfies item (2)in considerable measure, it falls far short of the highestpossible realization of the first two essentials. Much 1 For a general discussion of fractional distillation and the… … Fig. 1—The special self contained distilling apparatus built by the author in 1916. Theimportant features are a highly efficient fractionating still head, close and nearly auto-matic regulation of the still head temperature, complete protection from disturbanceby outside influences, and a high…
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