--- In [email protected], "Darrell" <darrell.ev.smith@...> wrote:
>
> OK, let me refine my explanation. I'm using "chord" for the straight line
> segment from one point to another on the circle. I'm using "arc" for the
> straight line from the center of the chord to the curve.
The short distance from the mid point of a chord to the arc of the curve is
the middle ordinate. It's pretty common to field calculate a curve radius from
the M.O. and chord length but if you don't have a program in your computer it's
still easier to just draw it out full S scale size and see what it measures or
if preliminary planning draw it out at 1/2 inch or 1 inch equals one foot scale
and scale it with a drafting compass or dividers. ..DaveBranum
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