From Dead Media Archive
Wire recording refers to a method of recording audio by magnetizing a very thin steel or stainless steel wire.
One of the greatest advantages of wire recording is its broad applications. The uses for storage of audio data range from the personal to the professional.
Dictation was the most popular use for wire recording.
Rise to Relative Popularity
Notable Uses in Popular Culture
Audio from a wire recording criticizing President Truman, April 1952