image armstrong w g_supplement---electric movement_plate 10
Image number: RS.10665
Credit: © The Royal Society
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Electrical discharge



Creator - Organisation

Object type




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



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

The plate is inscribed below: “Plate X. TESLA COIL DISCHARGE BETWEEN SMALL DISCS.”

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

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