Custom apparatus commissioned by the author (P. E. Alessandri) to the Zambelli firm in Turin (Italy) to collect measurable volumes of gas. The apparatus is composed of a graduated cylinder A, wider at the bottom with two openings B and closed off with a stopcock S and an exit H. The apparatus is filled with mercury through a side tube C, then the gas is bubbled in through the side tube L, opened with a Mohr clip D: as the gas fills the graduated top portion, the displaced mercury leaves through side tube C, now placed horizontally. After the tube is filled, clip D is closed, arm C is raised, and the gas can be drawn by opening stopcock S. This apparatus is designed to collect and then dispense the gas produce by the degassing of 1-2 liters of water.
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Alessandri, P. E. Analisi Volumetrica Applicata Ai Prodotti Commerciali e Industriali; Ulrico Hoepli: Milano, 1895.