27 Jun
2019
27 Jun
'19
8:30 a.m.
On Jun 27, 2019, at 8:21 AM, Warner Losh via cctalk
<cctalk at classiccmp.org> wrote:
Back when I got to school and I was hanging around the computer room on
campus (back when it was THE room on campus with computers), I saw this
half-dollar sized plastic fob on the desk and asked what it was for. The
on-staff operator took a mag tape off the rack, opened it up and set the
end of the tape on the table. She then took the fob and placed it on the
end of the tape and all the iron filings that were suspended in the liquid
inside the fob aligned to the magnetic fields of the tape.
I don't recall seeing one of those in either of the computer rooms I worked in as a
student back in the late 1980s. I would love to get my hands on one (or make one?) now.
--
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/