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Large Induction Coil with Hertz Spark Gap...
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"Ancel" Induction Coil Set, c. 1910...
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Induction Coil with Righi Spark Gap, c. 1910...
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Group of Physical Instruments, c. 1920...
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5 Induction Coils, 1900 onwards...
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Large Induction Coil Based on Ruhmkorff's Des...
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French Induction Coil...
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2 Hand-Held Carbon Microphones...
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1 Dynamic and 5 Carbon Microphones, c. 1927...
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Sennheiser MKH 805 Shotgun Microphone, c. 196...
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Carbon Cross-Flow Microphone, c. 1938...
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1 Crystal and 5 Magnetic Microphones, after 1...
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A Group of 8 interesting Microphones, from 19...
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"Dralowid" Reporter Carbon-Microphone, 1927...
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"Lorenz Recordophone S33U", 1953...
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Loewe Opta Spinett Radio, 1955...
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Telefunken Audio-System, c. 1955...
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HMV 501 Radiogram, 1931...
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"Cosmophon" Radio with Record-Player, c. 1935...
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"Saba" Model W3 Radiogram, c. 1955...
