this post was submitted on 25 Oct 2025
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You can't calculate 2+2 with a slide rule
Maybe you can't
Moves C index to 2 on the D scale
Moves indicating line to 2 on the C scale
Reads 4 on the D scale
Good thing 2+2 and 2*2 yield the same answer. Would have to bust out the addiator otherwise
abacus say what?
Yoy can use 2 normal rules to add/rest 2 numbers, but you can't do it in a slide rule with its logarithm scales. But luckily there are solutions out there
Well, but fails with 3+3, there an US engineer must use still an addiator. Nowadays it's easier with an pocket calculator.
But a pocket calculator doesn't get you nearly enough street cred these days
Well, even an iPhone has an calculator by default (maybe with an monthly fe)
But when I'm at the club with my friends and I pull out the Pickett model N600-ES speed rule to calculate the tip, all the eyes are on me
In my studies I used a doble side rule, the Faber-Castell 2/83 N Novo-Duplex, 31 scales, not so practical for the pocket (>38cm)
You could probably do log_10(10²×10²) instead?
It's the same as 2*2
ln(2) + ln(2) = ln(4)
Try with 3+3
Sorry, that's too complicated for me