English Diagram of Hertz's radio transmitter and receiver...
231 63 181 477 506 926 English: Parabolic reflector made of zinc sheet metal attached to wooden frame focuses radio waves from dipole into beam 249 234...
English Hertz's experiment showing polarization of radio waves...
English Experiment showing refraction of radio waves...
English Experiment showing polarization of radio waves...
dipole antenna consisting of two brass rods with spark gap between them 58 17 133 65 594 241 Battery box English Replica of Hertz's spark radio transmitter...