A galvanometer is an instrument to detect electric current. An ammeter is a galvanometer calibrated to read Amperes (or Amps), the standard unit of current, named after the French scientist André Marie Ampère (1775-1836). Most galvanometers use either moving magnets, in which the magnet is turned by the field set up by the current in a coil, or moving coils, which turn in a magnetic field as a current is passed through the coil. Often a mirror is attached to the moving part of the galvanometer, allowing the angle of deflection to be magnified and measured using light beams.

027  Hot Wire Ammeter   Early 20c
028  Electrodynamometer   1865-1890   .
029 Galvanometer mid to late 19c Signed: Made by Yeates & Son Dublin Base diameter 91; height 37 A turned boxwood
030 Ayrton Mather Galvanometer
031 Ayrton Mather Galvanometer Inserts
032 Deprez-D'Arsonval Galvanometer
033 "Economic" Galvanometer
034 Nobili Astatic Galvanometer
035 Lecture Galvanometer
036 Kelvin Mirror Galvanometer
038 Mirror Galvanometer Movement
040 Sullivan Moving Coil Relay Galvanometer
041 Tangent Galvanometer
043 Helmholtz Tangent Galvanometer
044 Stewart Tangent Galvanometer
045 Upright Galvanometer

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