Galvanometer

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Item ST 22124 Galvanometer - Thomson Type, Unknown Make, Melbourne Observatory, Victoria, circa 1880s-1900s

Summary

Thomson (Lord Kelvin) type galvanometer on wooden base. Used at Melbourne Observatory. Probably dates from around 1900. No manufacturer's markings.

A galvanometer measures electrical currents.

The mirror galvanometer was developed by Lord Kelvin (Sir William Thomson) while working on improving electric telegraphic apparatus and was patented in the 1858. It was used for measuring electric currents when high accuracy was required or when measuring high resistance.

Physical Description

Two coil system with air damping. Curved zeroing magnet on slider, with fine screwthread control. 3 terminals. Levelling screws on base. Brass metalwork.