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While common magnetic tape uses very thin, plastic-coated iron oxide, “talking rubber” uses rubber impregnated with iron oxide. Iron oxide (a form of rust) is ferromagnetic, which means in the presence of a magnetic field, the electrons in the iron oxide magnetically line up and stay that way even after the magnetic field is turned off. This allows cassette tapes to create a “track” of magnetically aligned iron oxide when the electromagnet in a cassette recorder creates a magnetic field. But with magnetic rubber, the iron oxide is actually mixed into the rubber material; the whole band becomes ferromagnetic, instead of just the coating. According to that Bell System Journal article, this “talking rubber” could be around 1/16 or 1/8 of an inch think, whereas magnetic tape was (even in the '50s) already much thinner at 1/1000 of an inch thick. At the time, local telephone companies provided a service where you could call and someone would tell you the current time or the current weather report (eventually they also had some recounting current stock reports). The “talking rubber” invention allowed AT&T to record these very short messages and play automated time, weather, or stock reports over the phone. Except the technology never caught on; magnetic tape, not rubber, reigned. Part of this may have been due to the short nature of rubber recordings, because the rubber was so much thicker than tape. As Morton wrote in an e-mail, “you could easily record hours of phone messages on a reel of tape no bigger than [a] 30-second band” of magnetic rubber. But in the end, Morton sees the demise of the magnetic rubber as due to a “range of technical and non-technical reasons.” The magnetic rubber did come with more background noise at low frequencies than magnetic tape, and there many have been cost concerns, but there was also a patent issue. |
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i'm curious what the dynamics would be like. it sounds like the tape equivalent of 24-bit recording |
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what does talking rubber sound like when fed back on itself? |
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bounce that mix down to rubber m8 |
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sellotape can make x rays |
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is responsible for that. |
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does that mean if you wank really really hard you can use your knob as a torch? |
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seriously though interesting post |
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talking rubber? |
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or were you talking luminescence? |
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