NOYDB wrote:
>
> I find that I frequently want to adjust a recipe up or down in
> quantity. I use an old slide rule to set up the original proportion (
> set the 1 over the adjusted quantity; 2, 3, .5, whatever ) then read
> the new quantity directly under the original quantity. Sometimes
> there's a problem in measuring the new quantity exactly though.
>
> Anyway I was wondering if anybody else does this or if I'm just an old
> geek. I started using a sliderule studying electronics in the '70's.

No I don't use my slide rule It was my primary school maths prize and
that was probably the last time it got used.