AC_or_DC_X-Ray_Tube Ajax_Coil Ajax_Coil_Modalities Ajax_Hercules Ajax_Special Auto-Conduction_Cage-Horizontal Auto-Conduction_Upright Browne_Coil Campbell_Coil_Strong Campbell_Coil_Strong_Color1 Campbell_High_Frequency_Coil Cole_Coil Crisholm_Williams_Double_Resonator Cyclone_Coil_Portable Cyclone_Coil_Strong E-Ducretet_Tesla_Apparatus Electrolytic_Interrupter Gaiffe_Heavy_Solenoid Gaiffe_Transformer High_Frequency_Photo Isenthal-Oudin Isenthal_Complete Jackson_Coil Jackson_Coil_Spark-Gap Kinraide_Coil_2 Kinraide_Coil_Strong Mercury-Dip_Interrupter Mercury-Jet_Interrupter Meyrowitz_Coil Nodon_Valve Oudin-Dean Phosphorescent_Solids Piffards_Hyperstatic_Transformer Piffards_Spiral Pyrrhoea_Electrodes Ruhmkorff_Coil Scheidel-Western_High_Frequency Sheidel-Western Single_Focus_With_Cone Strong-Ovington_Apparatus Strong_High_Frequency_Tubes Strongs_Portable_Battery_High_Frequency Swett_And_Lewis_Milliamperemeter Swett_Lewis_Double_Bulb The_Knott_Apparatus Thompson_Double_Focus Wehnelt Williams_Cabinet Williams_Oudin_Resonator Williams_Small_Resonator dArsonvals_High_Tension_Coil