1), which is reproduced from the memoir of M. Moissan. It
consists essentially of two parts--the electrolysis apparatus and the
purifying vessels. The electrolysis apparatus, a sectional view of
which is given in Fig. 2, is similar in form to that described in the
paper of 1887, but much larger.
The U-tube of platinum has a capacity of 160 c.c. It is fitted with
two lateral delivery tubes of platinum, as in the earlier form, and
with stoppers of fluorspar, F, inserted in cylinders of platinum, _p_,
carrying screw threads, which engage with similar threads upon the
interior surfaces of the limbs of the U-tube. A key of brass, E,
serves to screw or unscrew the stoppers, and between the flange of
each stopper and the top of each branch of the U-tube a ring of lead
is compressed, by which means hermetic closing is effected. These
fluorspar stoppers, which are covered with a coating of gum lac during
the electrolysis, carry the electrode rods, _t_, which are thus
perfectly insulated.
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