HistoryMagnetic recording proved viable and available in 1898 through the wire recording inventions of Valdemar Poulsen  Up until about 1955 wire recordings were used for instantaneous, dictation, and field recordings. The wire is wound on metal on metal or plastic spools.
Technical DetailsWire recordings are made of stainless steel wire. Some, from the mid-1920s, are on 6mm "wire tape."
Wire is stable, but it is an obsolete format. The wire format's primary problem is mechanical; for instance, it easily tangles or breaks.
Conservation Products & Supplies
This article uses material from the Wikipedia article Valdemar Poulsen which is released under the Creative Commons Attribution-Share-Alike License 3.0.