World English Dictionary
electrograph (ɪˈlɛktrəʊˌɡrɑːf, -ˌɡræf)
1.  an apparatus for engraving metal printing cylinders, esp in gravure printing
2.  the equipment used for the electrical transmission of pictures
3.  a.  a recording electrometer
 b.  a graph produced by this instrument
4.  a visual record of the surface composition of a metal, obtained by placing an electrolyte-soaked paper over the metal and passing a current through the paper to an electrode on the other side

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