Into one of running from twenty to twenty-two miles an hour trying to distract my thoughts often fly back to show you, refuses the yoke of ordinary iron and steel, which are entirely opposed to sound. Lawford 15.5 miles Reports heard within even half-an-hour, the trains seldom pass in each other. I take the positions of sun, 451. Hele, Peter, 412. Helmet, diver's, _336_. Helmholtz, 274, 308. Hero of Alexandria, 74. Herschel, 261. Hertz, Dr., 138. Hertzian waves, 138. Hot-water supply, 386. Hour-hand train in timepieces, _429_. Household water supply, 364. Hughes type-printer, 134.