The reappearance of the residual charge is promoted by tapping the glass.
Both observers noticed analogous effects in the residual magnetization.
If the light exerted direct impulsion on the vanes, their motion would gradually drag the case round after them, by reason of the friction of the residual air in the bulb and of the pivot.
Old perfume bottles are pretty, but if there's any residual scent in the bottle you'll want to make sure the scent of the salts matches.
Analogous changes are observed in the residual magnetization which remains after the wire has been subjected to fields of different strength.