box of pith balls
Date: 1920-1950
Inventory Number: 1997-1-1343
Classification: Electrometer
Subject:
Maker: American
Cultural Region:
Dimensions:
ball: 1.4 × 1.2 × 1.2 cm (9/16 × 1/2 × 1/2 in.)
box: 2.3 × 4.9 × 4.9 cm (7/8 × 1 15/16 × 1 15/16 in.)
Description:
Five pith balls in a cardboard box, all balls have a black thread attached to them.
Signedunsigned
FunctionUsed for experiments showing the effects of electric charge on the balls' motion. For a description of one such experiment, go to the following website.