The receiving instrument consisted of six galvanometers with magnetic needles, suspended from the silk threads.
The vibration galvanometer is used for detecting alternating currents in the frequency of its natural resonance.
These used a moving pen attached to a galvanometer to record telegraph signals.
The apparatus is also known as a "spot galvanometer" after the spot of light produced in some models.
It consists of lasers, mirrors, galvanometer scanners and other optical components housed in an enclosure.
Resonant galvanometer scanners are used for this application.
This induces a current in the coil which can be registered on the galvanometer.
The galvanometer showed some kind of reaction about one third of the time.
