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Description
Early 20th century Marconi style variometer / varicoupler / radio tuning coil.
"Also known as a "Receiving Transformer", loose couplers were used extensively in receivers built during the "teens". The coupler consists of two coils, a primary and a secondary. The primary coil is stationary and is usually provided with a slider for varying the inductance by single turns. The secondary coil slides in and out of the primary to vary the coupling, and is designed with several switch points in order to change its inductance. By the early 20's the loose coupler had lost favor as a tuning element to variometers and variocouplers,
with their advantage of smaller size and panel mounting.
Condition
Good Overall - Gentle wear; tape residue
Dimensions
11.5" x 5.5" x 10" (Width x Depth x Height)