Nobili's astatic galvanometer
= Nobili's astatic galvanometer
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The historical <Leopoldo Nobili> instrument combines a many-turn coil with an astatic needle pair. In a common geometry one needle responds strongly to the coil while its oppositely magnetized companion reduces the terrestrial restoring torque.<Astatic Galvanometer, Nobili Pattern by Museo Galileo>[Inventory 1417]{ref}