Rain Alarm with Drop-of-Water Contact
A Drop of Rain Water Completes the Bell Circuit, Thus Giving Warning of the Rain
An annunciating device, which awakens a person sleeping in a room with the window open and warns him that it is raining, so that he may close the window, is an interesting bit of electrical construction. On the outside of the house, as detailed, is a funnel fixed to the wall. At its small end, two separate wires have their terminals. The wires enter the room at the frame of the window, and connect to an electric bell, and a dry cell. A drop of water entering the funnel, flows down to the small end, falling on the terminals of the wires, and acting as a conductor, completes the circuit, ringing the bell. A switch inside cuts out the circuit, stopping the bell’s ringing.—John M. Chabot, Lauzon, Quebec, Can.