[modeleng] Re: Scale

I believe that Hy, Greenly was responsible for that as
well as many of the smaller guages.
Dont remember why he picked that, although I think it
is one of his books.
Alan

--- Ron Head <ron.head@xxxxxxxxxxxxx> wrote:

> Hi John
> 
> The usual scale for 3.1/2" gauge is 3/4" to the foot
> (i.e. 1:16) - unless 
> perhaps the prototype is 2'-0" gauge, in which case
> 1.3/4" to the foot is 
> appropriate.
> 
> I think the various gauges have their origins in
> Gauges "0" (1.1/4") and "1" 
> (1.3/4"), laid down about 100 years ago by pioneers
> such as Basset-Lowke. 
> In the days before pocket calculators, designs were
> scaled up or down by 
> simple whole-number multiplication factors.  Thus
> "00" is half of "0", 
> 2.1/2" is twice "0", 3.1/2" is twice "1", and 5" is
> four times "0".
> 
> The one that baffles me is 7.1/4", which should
> either be 7" if it is meant 
> to be four times "gauge 1", or 7.1/16" if it is
> meant to be one eighth of 
> 4'-8.1/2".  No-one has ever satisfactorily explained
> to me where the odd 
> quarter of an inch came from!
> 
> Regards
> Ron
> 
> 
> ----- Original Message ----- 
> From: "John Walford" <jwme@xxxxxxxxxxxxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Tuesday, January 24, 2006 6:10 PM
> Subject: [modeleng] Scale
> 
> 
> > I've been in contact with someone who wants some
> model wagon wheels
> > scale 1.75in to the foot. when I queried this, he
> said it was to
> > match 3.5in gauge rolling stock. Does anyone know
> the origin of all
> > the apparently odd, model railway gauges.
> >
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