Glass bulbs when filled with a potassium hydroxide solution are used for the absorption of carbon dioxide in chemical analysis. Types of potash bulbs depicted here include: Geissler's, Geissler-Wetzel's, Alvergnat's, Bender & Hobein's, Delisle's, Gomberg's, Koeninck's, Mitcherlich's, and Schloesing's.
Emil Greiner Company. “Various Potash Bulbs.” Illustrated Catalogue of Scientific Apparatus, Chemical Glassware and Laboratory Supplies. New York (State), 1910–1919. https://digital.sciencehistory.org/works/ng451h549.