Before revision: Iron-hydrogen resistor External links Patents , "Current Actuated Wave Responsive Device" – August, 1902 ("barretter" detector) , "Receiver for Electromagnetic Waves" – May, 1903 (improved "barretter") Other Detectors of electrical oscillations Tech Definitions - Radio Concepts United States Early Radio History Secor, H. Winfield (January, 1917).
After revision: Iron–hydrogen resistor External links Patents , "Current Actuated Wave Responsive Device" – August, 1902 ("barretter" detector) , "Receiver for Electromagnetic Waves" – May, 1903 (improved "barretter") Other Detectors of electrical oscillations Tech Definitions - Radio Concepts United States Early Radio History Secor, H. Winfield (January, 1917).