Object is metal disk with a round window. Inside is fluid containing iron particles. Device can be placed on a magnetic tape to reveal the bit pattern.
Packaged with it a piece of magnetic tape that was in the original wooden box.
Manufacturer
3M
Identifying Numbers
Other number
11274
Engraved into the top
Dimensions
overall: 1/2 in x 2 in x 2 in
Category
Memory & storage/tape
Credit
Gift of Lawrence Livermore National Laboratory (LLNL)