Since most clocks experience changes in the driving force to the escapement, some means must be found to equalise this force. The remontoire (literally re-wind) is such a device in which the clock train does not drive the escapement directly but winds up say every half minute a small spring or weight which drives an ordinary escapement.
The device is illustrated in the photograph. Eight pins are attached to the yellow gearwheel. An indexing fork piece engages with each pin in turn, moved by a cam in the shape of a fishplate. A locking plate behind the fish plate prevents rotation of the main gear train until the indexer moves on the gearwheel. The gearwheel forms part of the escapement.
Fig. 1 Meccano Remontoire