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kolbernes åbning tildækkes, f.eks. med aluminiumfolie, på en sådan måde, at luften frit kan passere ind og ud af kolberne, dernæst startes testen ved, at kolberne anbringes i rysteapparatet,
cover the openings of the flasks, e.g. with aluminium foil, in such a way as to allow free exchange of air between the flask and the surrounding atmosphere. then insert the vessels into the shaking machine for starting the test.