Another great Victorian, Heinrich Hertz, lived only thirty-seven years (1857-94), but in his short creative career he was able to discover, by the most ingenious methods, a whole range of hitherto unimagined electric waves which could be reflected and refracted like waves of light. It was from the knowledge of the Hertzian waves that wireless telegraphy was developed by Marconi and others; and this has been followed during the past thirty years by the development of television and radar. Then began another enormous modern industry using vast amounts of copper and copper alloys for applications which now include printed circuits and wave-guides.
