Clock rewound by hydrogen gas by Pasquale Andervalt, Trieste, Italy, c.1835. Brass skeleton-type frame. Enamel dial with open centre to expose the mechanism. Steel hands. Pin-wheel escapement and decorative gilt pendulum. The clock is mounted onto a large red glass cylinder, and above the movement is a tubular coiled brass magasine. The glass cylinder is designed to hold a solution of dilute sulphuric acid, and the coiled brass tube to contain zinc pellets. Clock rewound with hydrogen gas by Pasquale Andervalt 1835