Nobili's portable galvanometer for "hydroelectricity" | Leopoldo Nobili
Nobili's portable galvanometer for "hydroelectricity"
The black wooden base carries a lead stabilizing ring painted red. A cylindrical glass cover carries the suspension for the astatic needles. The coil, wound on a boxwood bobbin, has many windings of fine wire, probably silver, covered with silk. The number of windings and the diameter of the coil wire [...]