Analysis of information sources in references of the Wikipedia article "Induction coil" in English language version.
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The electrolytic interrupter consists of a vessel containing a solution of dilute sulphuric acid with two terminals immersed in this solution. The positive terminal or anode is made of platinum and should have a surface of about 3/16 in.[sic] The negative terminal or cathode is made of lead and should have an area of something like 1 sq. ft. When this interrupter is connected in series with the primary of an induction coil and a source of electromotive force of about 40 volts, the circuit will be interrupted, due to the formation and collapse of bubbles on the platinum electrode.
{{cite book}}: ISBN / Date incompatibility (help) Page 31 describes electrolytic interrupter, but does not identify as Wehnelt interrupter.