| Field |
| Listening to audio recordings |
| Went Obsolete |
| Early '70s |
| Made Obsolete By |
| Replacement of reel to reel by compact cassettes |
| Knowledge Assumed |
| Memory of using tape recorders |
| When useful |
| Never! |
Reel to reel tape recorders used open reels on which the magnetic tape was wound. Audio was stored on the tape by magnetically imprint variations of flux, which could then be read back by a coil sensitive to these minute flux changes. The tape was a thin film of polyester and was quite tough, but over enthusiastic rewinding or jambing of the tape in the pinch rollers that carefully controlled its speed during recording and playback (otherwise the pitch would warble) sometimes led to the tape breaking. One would use a small metallic clamp to hold the ends of tape for cutting with a razor, then position them to allow a tiny amount of glue to be applied to the ends and rejoin the tape. Too much glue and the stiffen joint would snap or jamb, misalignment would result in the tape jumping off the rollers.
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