Mantel clock

The form, first developed in France in the 1750s, can be distinguished from earlier chamber clocks of similar size due to a lack of carrying handles.

Indeed, it looked like a standard tall clock whose hood and base were directly conjoined and whose body was missing.

Simon Willard's shelf clocks were weight-driven and some models had an extended base for the weight so they achieved a one-week running period.

The pendulum length could be adjusted through a hole in the clock face at the 12 o'clock position, so it was not necessary to open the case.

The Willard Brothers revolutionized the clock manufacturing by both labor division and using multiple previously molded parts.