Ah, Sinclair’s calculators!! – you just reminded me I had an ancient old Sinclair “Cambridge Scientific” calculator stuck away in a cupboard somewhere since the seventies (heaven knows why I’d kept it). I managed to find it and put some batteries in it. Did it still work?-
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Well no, not really, although the tiny LED display lights up, the keyboard is pretty hit and miss. I remember how it always was a bit flaky, you had to push the buttons very carefully and deliberately, but it’s next to useless now. Actually it wasn’t a very good scientific calculator even at its best – the trig functions were based on simple algorithms that were particularly inaccurate. So after all these years I thought I’d have a look inside before I finally threw it away, sadly there wasn’t much to see!-
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As you said clearly no expense had been spent in making this stuff!