pith-ball electroscope
Date: 1850-1900
Inventory Number: 1997-1-1315
Classification: Electrical Apparatus
Dimensions:44.5 x 8.5 cm (17 1/2 x 3 3/8 in.)
Description:
Brass hook standing upright on a circular base. A thread is attached to the hook's end. A gilded pith ball hangs from the thread.