Description
opening day
27th October 2000
Francia sculp
By the late 1950s
inscribed 'L'observatoire royal commencÚ en 1667
Electrical discharge mb-artistname Wenceslaus Hollar opening dayPatterns 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
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