The magnetic detector or Marconi magnetic detector, sometimes called the `Maggie`, was an early radio wave detector used in some of the first radio receivers to receive Morse code messages during the wireless telegraphy era around the turn of the 20th century. Developed in 1902 by radio pioneer Guglielmo Marconi from a method invented in 1895 by.....
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http://en.wikipedia.org/wiki/Magnetic_detector
One of the first practical devices able to make radio signals audible through a pair of earphones. Marconi's Magnetic Detector was first patented in 1902; it was an important advance and more sensitive than the coherer. In conjunction with the Multiple Tuner, the Magnetic Detector was the standard form of spark telegraphic signalling device betwee...
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https://www.encyclo.co.uk/local/20820
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