Spot Galvanometer

The Cambridge Spot Galvanometer is a highly sensitive instrument designed to measure minute electrical currents.

Its key feature is its ability to magnify tiny movements through a unique optical system:

• A beam of light is reflected from a mirror onto a distant scale.
• As the mirror rotates, the light spot moves across the scale, acting as a long, weightless pointer that greatly amplifies the small mirror rotation.
• This precise movement of the light spot enables extremely accurate measurements of even the smallest currents, far surpassing the sensitivity of instruments with physical pointers.

This specific galvanometer model features:

• Scales ranging from 0 to 100 and 50 to 0 to 50.
• No tuning wheel on the front.
• A top-mounted switch.
• Two terminals at the back.
• An external power connection for the spot lamp.

In questo link sono elencati 17 modelli, di cui 17 con immagini e 9 con schemi.
Elenco delle radio e altri apparecchi della Cambridge Scientific Instrument Co.; Cambridge