Summary
Reisz type microphone, home-made by donor in 1932, when he was 13 years' old.
The Reisz design consists of a pair of electrodesat either end of a narrow channel filled with carbon granules and covered by a thin mica diaphragm. Sound impinging on the diaphragm varies the resistance of the carbon granule channel. this type of microphone was used for broadcasting in the 1920s and early 1930s.
Physical Description
Made from red gum block with gold plated electrodes and carbon granules. The red gum block was hollowed out to make cavity for electrodes and carbon granules. Mica diaphragm at front is covered by flywire. Front panel is ebonite. Supported in metal cage by 4 springs.
More Information
-
Collecting Areas
-
Acquisition Information
Donation from Mr Milton Crompton, 1986
-
Past Owner
-
Inscriptions
None
-
Classification
-
Category
-
Discipline
-
Type of item
-
Overall Dimensions
80 mm (Length), 200 mm (Width), 310 mm (Height)
-
Keywords
Electro Acoustics, Microphones, Radio Transmitting Equipment