Pole pieces for same magnet altering to annular gap, 1898
- Made:
- 1898
Pole pieces for same magnet altering to annular gap approximately 3 7/8" to 3 5/16", part of Oliver Lodge’s microphone amplifier or relay, 1898 (British patent 9712 of 1898) ), a precursor of the moving-coil loudspeaker
Details
- Category:
- Radio Communication
- Object Number:
- 1926-713
- Materials:
- metal (unknown)
- Measurements:
-
overall (smallest circle): 4 mm 77 mm, .004 kg
overall (medium circle): 14 mm 85 mm, .554 kg
overall (largest circle): 15 mm 110 mm, .184 kg
- type:
- pole
- credit:
- Sir Oliver Lodge.
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