noun
definition
A device used to indicate the presence and direction of a small electric current, especially used to detect a null or balanced condition in a bridge circuit.
Examples of galvanometers in a Sentence
Weber effected great improvements in them and in the construction and use of galvanometers.
For nearly a week futile attempts were made to send messages by his methods, and then a return was made to the weak currents and the mirror galvanometers of Sir William Thomson (Lord Kelvin) which had been employed for testing purposes while the cable was being laid.
Abandoning the long and somewhat heavy magnetic needles that had been used up to that date in galvanometers, he attached to the back of a very small mirror made of microscopic glass a fragment of magnetized watch-spring, and suspended the mirror and needle by means of a cocoon fibre in the centre of a coil of insulated wire.