galvanoscope


From The Collaborative International Dictionary of English v.0.48:

Galvanoscope \Gal*van`o*scope\, n. [Galvanic + -scope: cf. F.
   galvanoscope.] (Elec.)
   An instrument or apparatus for detecting the presence of
   electrical currents, especially such as are of feeble
   intensity.
   [1913 Webster]
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