The show’s oldest members, the Verge Fusee pocket watches,  featured the earliest form of mechanical escapement—the mechanism controlling the tick rate at which the gear train advances. Verge escapements were used nearly exclusively in watch and clock making for nearly 400 years, from the 14th through the 17th century. By the early 1800s, the verge was widely abandoned for more accurate escapements and slimmer fusees. The duplex escapement, displayed next to the verge in the Kimball exhibition, employs a frictional rest escapement, with a tooth applying resistance against the roller so that the balance is not fully free from the escapement. The Chinese Duplex pocket watches featured in the show were somewhat misleadingly named, in that they were not made in China, but are rather Swiss-made watches created for the Chinese market… 

excerpted from my review of “The Art of The Timepiece” for the Tourneau Blog: Our Minutes.

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