On Thu, 9 Nov 2023 16:18:17 -0600, Glenn Knickerbocker wrote: > >I've heard tales (probably at KTRU) of reading magnetic tape/cards with iron >filings and a loupe. > I believe I saw one. A flat container of ferrite slurry with a transparent top and a diamagnetic membrane bottom. Pressed against the tape, it clearly showed record gaps. Reading the data would have been a challenge, even at lowest density.
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