[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Curvature Calculator -Terminology glitch

Oops - Apologies to all re terminology, curves in the US are indeed measured
in degrees and grades are measured as a percentage.
I stand corrected. It looks like 50% is not a passing grade - I wonder what
does 45 degrees make?? :-) Regards, John Garaty

Kevin L. Shelton <wdepot@westerndepot.com> wrote in message
1e9al9q.ml71441udp3vgN%wdepot@westerndepot.com">news:1e9al9q.ml71441udp3vgN%wdepot@westerndepot.com...
> John Garaty <jkgaraty@1earth.net> wrote:
>
> > All,
> > For curvature, most the  "original" survey documents or the NSWGR were
> > measured in chains. I suspect that this is also the case for the
original
> > 3'6" gauge lines in Queensland, Tasmania, South Australia and Western
> > Australia. The Victorian 2'6" gauge Colac to Beech Forest track diagram
> > shows curves down to 2 chain radius (Reference "The Beechy" by N
Houghton
> > pages 4 & 5). Most narrow gauge railways (2') quote radius in either
feet or
> > metres.  These days metres are used as the dimension for curvature
radius in
> > Australia. In the US (Ever read articles in Trains, Railfan and
Railroad?
> > etc) curvature is quoted as a percentage.
> >
> Actually, curvature in the US is normally expressed in degrees. It's
> grades that are expressed in percentages.
>
> > Have fun regards, John Garaty
> >
> > David Johnson <trainman@ozemail.com.au> wrote in message
> > news:38F9B4CC.8129E732@ozemail.com.au...
> > > Bob May wrote:
> > >
> > > > I'd give a bit of descriptions on the page, drop the chain
calculation
> > > > (as others have said, it is pretty esoteric and subject to mistakes
in
> > > > the length of the chain)
> > >
> > > I will put descriptions in, but not drop the chain radius.  In
Australia,
> > all
> > > our curve and gradient diagrams give radius in chains.  This was one
of
> > the main
> > > reasons for making the calculator in the first place.
> > >
> > > --
> > > David Johnson
> > > trainman@ozemail.com.au
> > > http://www.ozemail.com.au/~trainman/
> > > ------------------------------------
> > > These comments are made in a private
> > > capacity and do not represent the
> > > official view of State Rail.
> > > C.O.W.S. Page 11.
> > >
> > >
>
>
> --
> The Western Depot invites you to visit its web site:
> http://www.westerndepot.com/