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Beospir D on cardboard

This spiral-shaped coil is very similar to the ‘Margulies’ coil. At its end are a small nub and two threads. The object has been mounted on a piece of black cardboard.

 

Inventory number: 1840
Material: plastic (impregnated with barium)
Dimensions, in cm: 2,2 x 3 x 0,2
Condition: very good
Donor: Robert Snowden