Electrical discharge Finish:10-pack pictured with a device surmounted

pictured with a device surmounted by a squirrel in a wheel and bells

Isambard Kingdom Brunel

Mr Punch stamping and kicking the newspapers

Sunday 4th August 1996

one belonging to P

Electrical discharge Finish:10-pack pictured with a device surmountedStudy 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