Crown radius = how much arch in a segment ?

[Richard Moody]

> >I suppose someone is wondering what height of the arc would be
across
> >a segment  (chord) of 36 inches with 72 inch radius.... 2.863.    I
>> At 24 inches it is almost exactly 1 inch.   ---ric
>
>
> Making that a 72 foot radius instead of 72 inches might make some
> difference in the rise too.
>
> Ron N

3/16 "   at 72 foot radius   (span of 36 inches)  ....need a *12 in
that formula.

---ric