To fix an electric bell to a Vienna regulator clock, arrange the electric circuit so that the battery is in a convenient position, and the bell in the bedroom; include the clock in the circuit. One wire should be carried through the case and soldered or screwed to any part of the brass movement, preferably the front plate. The other wire should be carried to the edge of the dial, and should lie flat upon it pointing towards the centre, the end being brightened and hammered flat so as not to stand up much from the dial surface. A piece of paper gummed on the dial beneath it will serve to insulate it. The connection is made by the hour hand having a thin flexible piece of brass soldered to the end of it to make contact with the copper wire at the dial edge as it passes over it. This extension may be painted white, so as not to confuse the eye. This arrangement will make contact every twelve hours, but may be switched off during the day.