Annular gap (cylindrical body) electro-magnet No. 3, c..1898
- maker:
- Oliver Joseph Lodge
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Annular gap (cylindrical body) electro-magnet No. 3, assembled with polar gap approximately 19/16" to 1 1/4", 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:
- 1926-711
- Materials:
- wood (unidentified), brass (copper, zinc alloy) and metal (unknown)
- Measurements:
-
overall: 178 mm 210 mm, 6.398 kg
- type:
- electro magnet
- credit:
- Sir Oliver Lodge.
