also called the Gravigard
Coil in the shape of a 7. Its shaft is wound round with copper. A thread is attached to the coil. Mounted on black cardboard.
Inventory number: 1851
Material: plastic, copper
Dimensions, in cm: 2,6 x 3,5 x 0,2
Condition: very good
Manufactor: Searle Laboratories
Donor: Robert Snowden