Dead point, 47. De Brouwer stoker, 401. Detector in Chubb lock, 436; Yale lock, 436. Combustion, 26, 393; perfect, 28. Compensating gear, 107, _108_. Gear-box of motor car, 110; railway, 187; vacuum, 189, _190_, _191_. Vacuum chamber of aneroid barometer, _330_. Valve, piston, 67; safety, 32; of internal-combustion engines (p. 101) to the bearing of the two ends.