French mantle clock with tellurian, c. 1810, attributed to Janvier. Two train, Tic-Tac escapement, half second pendulum, hour and half hour strike on count wheel. An orrery is mounted to the top of the clock case and is driven by the clock in real time as well as by a demonstration key.

The mechanics, dial and overall design of the tellurian follows closely to those from many other clock makers. It was likely supplied by a third-party source to all of these clock makers. There is a discussion of this