An instrument for detecting the presence of electric current; a simpler alternative to a galvanometer that shows whether current exists rather than measuring its strength.
From galvano- (galvanism) + -scope (from Greek skopein, to observe). Created as a basic detection tool before galvanometers were developed to allow precise measurement.
A galvanoscope was like the smoke detector of early electricity—it just told you 'hey, electricity is present!' without telling you how much, which was actually pretty revolutionary when nobody knew what electricity really was.
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