Abstract: To remove a layer of thick mercury from the bottom of electrolysis cells having a cathode formed by a film of mercury flowing over the bottom, a scraper is moved in the mercury film in a controlled manner to leave continuously a residual film of thick mercury of predetermined thickness adhering to the bottom. The process applies to mercury-cathode cells for the electrolysis of aqueous solutions of sodium chloride.

Abstract: A unipolar electrolytic cell having a baseplate and anode plates disposed parallel and substantially vertically. Each anode plate is mounted on at least one anode support fixed to the baseplate and leakproof thereon. Each anode plate is connected to at least one current lead disposed beneath the baseplate. The cathodes of the cell alternate with the anodes. A casing above the baseplate surrounds the anode plates and cathodes. A cover is provided above the casing and conduits for admission of a solution to be electrolyzed and for removal of the products of electrolysis. The current lead rests on a fixed prop and supports an anode support. The anode support passes through the baseplate and support at least a part of the baseplate above the current lead.