
4 0 c m
34cm
actual image size: 26cm x 32cm
Description
This instrument consists esentially of two bras balls. The lower one is supported on an insulated blue glas pillar; the upper one can be held at the required height above it by a catch. The catch can be released to let the upper ball make contact with the lower one. Either ball could be earthed while the other was charged.
Image Details
Image Ref.
10211962
© Science Museum / Science & Society Picture Library