Drum
The barrel of a turret clock on which the driving cord is wound. There is a variety of escapement, known as the Drum Escapement, which is met with but little in this country. Britten says this variety of escapement is a continual source of trouble to English repairers. It receives impulse from every other vibration only, and the idea of the escapement appears to be, that by providing a long frictional rest on one of the pallets, the extra pressure of the escape wheel tooth, when the mainspring is fully wound, will be sufficient to prevent any considerable increase in the arc of vibration of the pendulum. Clocks with this escapement, however, often stop from the diminished power when the spring is nearly run down, again, when it is fully wound, will be sufficient to prevent any considerable increase in the arc of vibration of the pendulum. Clocks with this escapement, however, often stop from the diminished power when the spring is nearly run down, again, when it is fully wound, because the small and light pendulum has not the energy to unlock the pallet.