Electrical discharge Size:L: 90 x 60cm Vestibule of the Coal Exchange

Vestibule of the Coal Exchange

Plate 9 from the paper 'Proceedings relative to the accident by lightning at Heckingham'

From Contributions to solar physics

of which this is one of the last to be built

Electrical discharge Size:L: 90 x 60cm Vestibule of the Coal ExchangeStudy 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