Ringing a Bell by Touching a Gas Jet
Touch the Gas Jet and Ring the Bell
The experiment of scuffling the feet over a carpet and then producing a spark which will light the gas by touching the chandelier is described on another page. One of our correspondents says that if a wire is connected to the chandelier and led to one terminal of the coherer of a wireless telegraph outfit the bell will ring every time the spark is produced by touching the chandelier, and that, as the chandeliers are all connected by the gas-pipe, the bell will ring, no matter in which room the spark is produced.
Lead Kills Knots
The covering quality will be greatly improved if some dry red lead is added to the shellac varnish used for killing knots.