Hi - try a Google for a free/share(?) Java programme called "Picker". Sorry
can't remember who the author is.

It let's u "pick" points with the mouse from a scanned image and save them as a
numeric file. It's main use is to grab scientific numeric data from, say, a
scanned PDF or GIF image of a graph that that's been print published without a
table of data & u want to do ur own analysis ....

That might be useful to acquire the raw figures from the nomograph but of
course you'd then have to scale & interpolate them numerically.
Debbie :)

 --- Doug Hewett <DHewett@STARTRAC.COM> wrote: > Suppose a nomograph with three
lines (A, B, and C) is scanned.
> What software package allows the user to select tickmark I on line A and draw
> a set of lines through tickmarks J on line B until they intersect line C?
>
> The software should interpolate the intersection on line C between the
> tickmarks.
>
> Accuracy of +/- 5% would be acceptable.
>
> Thanks,
>
> Doug Hewett, CSDP
>
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