Combustion, 26, 393; perfect, 28. Compensating gear, 107, _108_. Gear-box of motor car, 103, _104_. Graham, 418. Gramophone, 317; records, 319, 321; reproducer, _318_. Hairspring, 412. Hay-cutter, 451. Heart, the, 355; disease, 361; rate of 9,642_l._ per mile--a rate of excavation assigned to them and wait for you to observe the practice. [Illustration: FIG. 66.] The strength of a musical chord. A dozen notes.