A French black slate mantel clock with calendar, thermometer and barometer, the two-train movemen

A French black slate mantel clock with calendar, thermometer and barometer, the two-train movement with Brocot escapement and outside countwheel strike on a bell, the enamelled chapter ring with Roman numerals and inscribed Miroy freres Paris, the clock set in a cylindrical case mounted on a rectangular base comprising a dial with day, date and month registers, a central thermometer and a barometer dial, 41cm high