NOYDB wrote on Tue, 19 Oct 2010 02:26:28 -0400:

> 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.

I remember first enthusiastically coming across a slide rule at the age
of 10. My father taught me some of the more simple usages and I still
have a collection of the things both straight and circular. However, I
usually still rely on mental arithmetic to adjust recipes even if I have
several calculators lying around the house. One of them is even light
powered.

--

James Silverton
Potomac, Maryland

Email, with obvious alterations: not.jim.silverton.at.verizon.not