Among Monticellos treasures is the Thomas Jefferson-designed 8-day Great Clock found in the Hall at Monticello. Driven, like the Great Clock, by hanging weights, this distinctive wall clocks 8-day skeleton movement gives a clear view of the fine precision mechanism. A melodious chime marks each hour. Made by Hermle, the renowned German clockmaker. 25"h x 6"w x 4"d.