VICTOR MEYER APPARATUS J. A. COSS Morningside College, Sioux City, Iowa
T
HE excuse for offering another modification of the well-known Victor Meyer apparatus for determining molecular weights is the fact that this apparatus can be constructed of materials found in every laboratory; and the further consideration that it works well in the hands of a student without expense for breakage. The outer jacket ( A ) is an ordinary 250-ml. Kjeldahl flask of pyrex glass; the second tube ( B ) is constructed from a common soft-glass Hemple tube by closing the lower end; the inner tube (C) is constructed of softglass tnbimg a little more than one-fourth inch in diameter by sealing a small side arm into it. The tube (C) is open a t top and bottom; the side arm has a glassrod plunger held in place by a short piece of gum rubber tubing.
When materials which have a boiling point below 100°C. are used, water is used in the outer jacket (A). The water is boiled rapidly so that the temperature in ( B ) is practically uniform throughout its entire length. With higher boiling materials a side arm is sealed into the outer jacket as near the to^ as vossible, and connected with & ai;condenser. The material of which the molecular weight is to be determined is sealed in weighed capillary tubes, constructed as shown a t (D). The tips of the capillary are drawn fine so they will break in falling from the plunger to the bottom of the tube (B). ., No claim is made for originality in the design of this apparatus. Our purpose is to call attention to an easily constructed apparatus that we have found more accurate than the regularly constructed Victor Meyer apparatus.
