oftheMaxwellequationisrewrittenasfourvectorequation.Thislaidtheideologicalfoundationforhislaterimportantexperiments.Buttherewasalackofinstrumentstoproduceandtestrapidoscillations,becausehedarednotacceptHelmholtz'srequestthathestudythesubject.InOctober1886,Hertzfoundtwolargecoilsfordemonstrationinthewarehouseofthephysics...