RoundUp on The Ultimate Math Program for Electronics

Unless your time is free, you'd be much better off starting with something like SciLab and Octave, since they already know about complex numbers, graphing, far fancier functions than you'll likely ever use, etc.

Nah, this is how real engineers do it:

Nope; this is how the real ones do it:

I have a similar one by Post, with Trig tables on the back... bought around 1958-59.

...Jim Thompson

Go digital:

The only round one I have is a pregnancy calculator for medical ultrasound :-)

Then a few elaborate rectangular slide rules where one of them is in regular use. Aristo Scholar VS, the one for engineers. My trusty old RF slide rule for filter calcs disintegrated, didn't like the move across the ocean :-(((

It's amazing how easily the salty air gets into freight containers in winter and how it can damage things. So, if anyone has to move across the pond don't do it in January like we did. At least not if the ship takes a northern route.

Ah, a timber based version. Nice.

Engineers in the times of the Romans would disagree though. They'd say that this is how it's done right:

Except that is not an abacus, it is a soroban.

As in " Succoring a Soroban "

Robert

No, it has two beads in the top row and five in the bottom row, a soroban has one on top and four below. it looks lika a chinese abacus to mee. it look very similar to the one my grandmother picked up in hong-kong (or perhaps singapore) except hers was probably tourist junk.

Anyway a soroban is an abacus.

Bye. Jasen

Yes and no, the fundamental concept is the same; an classic original Greek abacus is strictly decimal and the soroban is biquinary. Wikipedia shows that it was independently created in many cultures.