Home > History, Techo stuff > THIS is a slide rule

THIS is a slide rule

September 21, 2015 Leave a comment Go to comments

The costing clerks and accountants at Rowntrees used these in the ’60s, spinning them like magicians’ wands to mystify young marketing assistants. If you needed to know how any change to the KitKat packaging would affect earnings, you just had to watch the magic.

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Categories: History, Techo stuff
  1. September 21, 2015 at 1:13 pm

    Janus, I was in infants and junior school in the sixties. Had I come across one of these cylindrical gadgets I would probably have tried to roll it along the floor like a steam roller, or simply used it to hit my older brother 🙂

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