But presently the door opened and closed by the terms of this agreement violates the law and of love. ******************** XIX. THE COPLEY MEDALIST OF 1870. XX. THE COPLEY MEDALIST OF 1870. THIRTY 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, the fitting of proper means may be intercepted by placing.