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Description
Early 20th century variometer / varicoupler featuring two coils, one mounted inside the other. The outer coil is in an upright square wooden frame, and it has a circular cavity in the middle where the inner coil is mounted with a wooden spool.
"Variometer:An inductor whose total inductance can be varied either by altering the relative position of two coaxial coils connected in series or by the use of permeability tuning, and thus can be used to tune a circuit." (Source: Museum of History of Science, Oxford)
Condition
Good Overall - Gentle wear
Dimensions
5.5" x 3" x 5" (Width x Depth x Height)