Electrical discharge Size:L: 80 x 60cm View of Somerset House on

View of Somerset House on the Strand and the Adelphi beyond

Seated portrait of a man in wig and fur-trimmed gown

Half length portrait of Sir Archibald Geikie

Laurie Cunningham poses for the camera with a flower Madrid Spain

Electrical discharge Size:L: 80 x 60cm View of Somerset House onStudy 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