Here is a very well rounded list of physical constants
http://www.alcyone.com/max/reference/physics/constants.html

Duncan Adamson wrote:

> caternary is of the form
>
> y = (1/a)(cosh(a*x))
> where a is a constant
>
> note: this is equivalent to
> y = (1/a)((e^(a*x) + e^(-a*x))/2)
> where a is a constant
> where e is the standard mathematical constant 2.817.....
>
> Duncan
>
> "Nekar Xenos" <j-p### [at] citywalkcoza> wrote in message
> news:3bb481e2@news.povray.org...
> >
> > "Duncan Adamson" <dja### [at] docicacuk> wrote in message
> > news:3bb4754e$1@news.povray.org...
> > > Hang a rope from two points <0,1,0> and <1,1,0>
> > > The shape it makes is a caterary
> > >
> > > Rotate this shape around the x axis to get a catenoid
> >
> > >(formula radius =
> > > (1/a)cosh(ax))
> >
> > Is this the formula for a caterary or a catenoid? I'm looking for the
> formula
> > for a caterary.
> >
> > Regards,
> >
> > - Nekar
> >
> >
> >

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