21. The Accutron was different than previous watches as it did not contain a balance wheel or mainspring. 22. Seated at his bench, he picked up a watch escapement, the section that contains the balance wheel . 23. Ulysse Nardin in cooperation with GFD developed the first hairspring for the balance wheel in polycrystalline diamond. 24. This chronograph uses a balance wheel which oscillates at of a rate of 36, 000 alternations per hour. 25. The impulse pin is located within the lever fork and the balance wheel is near its center position. 26. The purpose of doing this was to eliminate the " middle temperature " error of the balance wheel . 27. British watchmakers used the English detached lever, in which the lever was at right angles to the balance wheel . 28. The roller jewel is responsible for coupling the motion of the balance wheel to that of the pallet fork. 29. The insurgency led to a fatal split down the middle in 1912 as the GOP lost its balance wheel . 30. As with the pendulum, the escapement must provide a small kick each cycle to keep the balance wheel oscillating.
