Adjustable spark gap, early 19th century.

 
Adjustable spark gap, early 19th century.
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

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