Why is plus on top?

[jhaible]

> But, what historical decisions lead up to putting
> the minority carrier at the top of the page. I mean
> if you follow the hydraulic analogy, the electrons
> should flow down from the top of the page.
>
> Anybody got any anecdotes?

I have no anecdotes, but what they told us in school was
that the "forward" direction was agreed on before the
electron being the mobile part in metal was known.
They had to define something, and the chances were 50-50.
No idea if this is the whole story or not.

JH.