I could if I still have my first slide-rule and can find it! It was an introductory type, only 6 inches long, and made by Blundell-Harling for issue in schools, in the 1960s.

Some years ago I wanted to perform a rather awkward calculation, part of a project problem in my hobby of model-engineering. I had no computer at the time, so could not use any PC-based calculator (nor of course Excel).


I could not find my calculator...,.

Ah, slide-rule, a full-length one so reasonably high-definition. B****r! Can't find that either!

Oh well, out with the text-books and revise using logarithms as times-sums tools, but which I was later to use in a scientific context elsewhere - they are NOT "obsolete".


Next day I bought a new calculator. Oddly, despite having the same functions as the lost one, it and all the others in the shop were no longer shirt-pocket size, but greatcoat-pocket dimensions. I never discovered why they were larger than hitherto when all other electronic devices were shrinking.

Looking for something else three weeks later, I opened a drawer - and there was the AWOL calculator! Sometimes I forget there are no such things as gremlins and poltergeists. After all, it can't have been me who'd put it there, and there was no-one else in the house.....

Nope.. just the scientific calculator in my phone

I possibly did at school. I was there in the 70s when log tables and slide rules were the way. Calculators appeared then but schools initially banned them. By the time I did maths @ level then went to college Casio scientific calculators had one the day. I had one that did hex which helped me debug z80 assembler code

That's not a slide rule in my pocket.

Way too long for my shirt pocket

Um... I always carry an abacus

you spying on me ? 🤔 if you dont like my shirt just say so 🤣

In my back pocket

oh dang 🤓 me sure did

Nah... need my hands and toes for counting. Ever tried counting to 100 with just your hands and toes? 👐👣 😉

At one time before calculators.

or a TRS-80!

so your what,,, 70?