different between deflection vs galvanoscope

English

deflection (countable and uncountable, plural deflections)

The act of deflecting or something deflected.
- 1918, H. G. Wells, Joan and Peter
  The next morning Oswald stopped short in the middle of his shaving, which in his case involved the most tortuous deflections and grimacings.
The deviation of a needle or other indicator from its previous position.

w:Luigi Galvani +? -o- +? -scope

galvanoscope (plural galvanoscopes)

A device used to detect electric currents, particularly one using the deflection of a magnetic needle.

galvanoscope m (plural galvanoscopes)

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