<On the show, they spliced the wire to reformat a message on the wire... d <you know what type of wire was used on these types of voice/data recorder <and how would you splice them? < <(oh, and could you re-record over a previously used piece of wire?) Lessee, yes you can re-record on used wire. In fact if you didn't erase it you would get a overdub! Oh, the wire is soft iron, though any wire of a magnetic alloy can be used. The technology date t before WWII to some time in the late 40s-early 50s. It's problems were poor frequency response, knots/kinks in the wire and head wear. Allison