Electrical discharge mb-artistname Wenceslaus Hollar Through the arch the Tower

Through the arch the Tower of London can be seen in the distance

grapes and a chestnut

It happens every day

inscribed 'L'observatoire royal commencÚ en 1667

The pedestrians are in distress

Electrical discharge mb-artistname Wenceslaus Hollar Through the arch the TowerPatterns 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