Title
Spiral spark tube
Identifier
ABDNP:201762a
Description
Glass tube with brass ends; with ball terminals; inside tube is spiral of small metal discs each seperated by gap of less than 1 mm; when tube is placed across an electrostatic generator, a spiral discharge is seen around inside of tube caused by sparking between metal discs
Date
1780-1810
Format
length 330 mm; diameter 25 mm
glass; brass; metal