291,420. Soc. Anon. Le Carbone. June 4, 1927, [Convention date]. Addition to 230,307. Gas batteries electrodes; electrolytes.-The invention of the parent Specification is modified by the addition to the porous carbon which has been rendered impermeable to liquids, of a metal such as lead which is capable of combining with chlorine. The Figure shows a cell consisting of a zinc or galvanized iron electrode i and an electrode consisting of a mixture b of lead and charcoal rendered impermeable to liquids as described in the parent Specification. The mixture is moistened with a solution of zinc chloride and is contained in a bag c with a carbon or metal conductor f<1>. The electrolyte is a solution of zinc chloride and zinc bromide.