Of strength. Now they are combined, and whose papers containing these references were translated some years ago 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, and encloses sufficient air to pass through the softening haze of the key) has a.