image armstrong w g_supplement---electric movement_plate 12
Image number: RS.10667
Credit: © The Royal Society
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Electrical discharge

Date

1899

Creator - Organisation

Object type

Material

Technique

Dimensions

height (print): 380mm
width (print): 275mm

Subject

Description

Study of patterns produced by electrical discharges on surfaces revealed by dusting with powdered red lead and sulphur. Sometimes termed ‘Lichtenberg figures’.

These experiments were conducted at Cragside in Northumberland, England, using a Wimshurst machine (electrostatic generator) and two 10-gallon Leiden jars. Current was conveyed to two rod conductors with a spark gap at which coated wires discs or plates were positioned. Lord Armstrong exhibited figures of the type produced at the Royal Society soiree at Burlington House in London on 16 June 1897.

Plate 12 from Supplement to Lord Armstong’s work on electric movement in air and water...by William George Armstrong and Henry Stroud (London, Smith Elder & Co., 1899).

The plate is inscribed below: “Plate XII. TESLA COIL DISCHARGE BETWEEN SMALL AND LARGE DISCS (LONG INDUCTION COIL SPARK).”

William George Armstrong, Baron Armstrong (1810-1900) armaments manufacturer and industrialist was elected a Fellow of the Royal Society in 1846.

Associated place

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