Re: Curvature Calculator

["HXP1" <hxp1@bigfoot.com>]

James Robinson <wascana@my-deja.com> wrote in message
8d5kve$k00$1@nnrp1.deja.com">news:8d5kve$k00$1@nnrp1.deja.com...
> trainman@ozemail.com.au wrote:

> > If anyone understands how the Americans do their curve calculations,
> can you
> > please test the calculator and let me know if I got the formulae
> right?  Thanks.

> The formulae appear correct, but I should make a couple of comments:

> - There may be some confusion with your use of "chains" as one of the
> parameters, since there are two types of chains:  The Ramden chain is
> 100 feet long, and the US Survey or Gunter's chain is 66 feet long.
> Most surveying in the US is done using a 100 foot chain, and curve
> measurement, when described by radius, is usually quoted in feet and not
> by chains.  Yes, chains are understood in Australia, but there could be
> some confusion to those not saavy with the differences.

The chain I know has 66 feet.  (And 100 links IIRC)

Well at least I hope so, as I had to calculate some Victorian Signal Style
Nos. the other day (for Level Xings), and I used 66 feet to the chain. |-)

If a chain has 100 feet, I'm in trouble. |-)

Long live metric.

--
HXP1
(now with v6.08 software)