It will be
remembered that, by passing a strong current of electricity through
this liquid contained in a platinum apparatus, free gaseous fluorine
was obtained at the positive pole and hydrogen at the negative pole.
The amount of hydrofluoric acid employed in these earlier experiments
was about fifteen grms., about six grms. of hydrogen potassium
fluoride, HF.KF, being added in order to render it a conductor. Since
the publication of that memoir a much larger apparatus has been
constructed, in order to obtain the gas in greater quantity for the
study of its reactions, and important additions have been made, by
means of which the fluorine is delivered in a pure state, free from
admixed vapor of the very volatile hydrofluoric acid. As much as a
hundred cubic centimeters of hydrofluoric acid, together with twenty
grms. of the dissolved double fluoride, are submitted to electrolysis
in this new apparatus, and upward of four liters of pure fluorine is
delivered by it per hour.
This improved form of the apparatus is shown in the accompanying
figure (Fig.
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