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Or alternatively,
Starting with the device shown by Loring, imagine you put the whole assembly inside a see through enclosure, removed the pointer, and replaced it with a tiny little mirror about 1/4″ across. (A surface reflecting mirror preferably). Now stand back a few feet and shine a torch onto the mirror while a friend passes a small current through the device, causing it to move and the mirror to twist slightly. See how the reflection of the beam of light moves.
If your galvanometer was against one wall of your room and your torch was on the opposite side and fixed to keep it steadily pointing at the mirror, and you held up a clear plastic ruler so the light was reflected on to it, you would have an enormous increase in sensitivity. In theory, you would have a meter movement with a pointer several feet long.
Some galvanometers have this complete arrangement all folded up inside a box with just two terminals on the front and a scale where the light beam moves along, being projected from inside.
Search for mirror galvanometer or spot galvanometer.