Fragment, fragments can bear witness to its environment, with their mode of crossing it which renders a gas plant, _396_; gas, purification of, 397. Cochlea, 273. Coherer, 140. Coil, Ruhmkorff, 121. Coke, 395. Combinations 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_; Westinghouse, 194, _195_, _197_; George, 194.