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Crystal radio loose coupler

£2450
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Crystal radio loose coupler Crystal radio loose coupler Crystal radio loose coupler Crystal radio loose coupler Crystal radio loose coupler Crystal radio loose coupler Crystal radio loose coupler Crystal radio loose coupler Crystal radio loose coupler Crystal radio loose coupler

Crystal radio loose coupler

£2450

An early prototype two coil crystal radio loose coupler, receiving transformer, circa 1910 - 15.

Stationary primary copper coil, with a sliding secondary copper coil which can travel by turning the helical screw at the end, the primary coil conations a variometer adjustable through 180 degrees with the handwhell at the side.

Width: 67 cm.

Depth: 27 cm.

Height: 22 cm.