A set of five Geissler glass discharge tubes

A set of five Geissler glass discharge tubes
Probably German, late 19th century
Of upright configuration, of ovoid form with various internal designs. To a fitted wood carrying case.
29cm high (one broken, one with internal fault) (5)

Geissler tubes were developed in 1857 by Heinrich Geissler, a German physicist and glassblower, to demonstrate the principles of electrical glow discharge, akin to contemporary neon lights, and central to the discovery of the electron.

Condition Report
One broken.  One has a section of tubing adrift internally and is lacking it's lower terminal.  The remaining three appear intact.

Bidding indicates acceptance of the condition of the lot.  All lots are sold subject to general wear and tear commensurate with age and handling over time and only obvious faults will be mentioned after a visual inspection. If you have particular specialist questions on any lot, please state these before bidding since we cannot and will not provide a forensic examination of any lot but only a general condition report as a guide only. All condition reports given by Halls Holdings Ltd's representatives or agents are statements of opinion and not fact. If you require any further information about any lots in this auction or about bidding please do not hesitate to contact us again.