Calculus suggests some sort of computer tape. Probably the TNMOC could
help. Old magnetic tape tends to go gooey and/or shed the oxide. It's
common practice to bake tapes before attempting to read..
Dave Wade
On 31 Mar 2016 09:44, "Hazel Simpson" <[log in to unmask]> wrote:
> Hi Sarah,
>
> References to Zonal Calculus (and then to Racal Zonal Calculus) suggest it
> could be magnetic computer storage tape from the early 70s.
>
> Regards,
>
> Hazel
>
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