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Loose Coupling Coils

The loose coupler has a copper wire spool on the left, and attachments for connecting wires in front and on the right of the spool.

Radio Galène, Loose coupler (c. 1920), Model: sliding core, 12 x 14 x 12cm. Musée des ondes Emile Berliner.

This is an example of a copper wire set. It was used as a primary tuning device for early radio receivers.