Re: "Cole Formula" *LINK*

This comes from searching the steam-tech yahoo group.
>The Cole formula was widely used by Draughtsmen to proportion
>Steam Locos. The NSWR 38 class is one.
>
>I.H.P. = 0.0229 x Boiler Press x area 1 piston,sq "(2 cyl loco) .
> x 1.5 for 3 cyls and x 2 for 4 cyls.,at 1000-FPM pist
> speed.
>
>Evap Lbs-Hr Firebox H.S x 55
>- plus Tubes and flues x 10 = total evap.
>
>Evap / 20.8 = RHP This applies to engines built about 1910-15.
>Evap / 19 = RHP is what Harold Youngs team used for the 38 class.
>
>This includes injectors,generators ,compressors ,stokers etc.
>
>The idea was for the boiler to produce more steam than the cyls needed.
But it was all a bit crappy really, the correlation between the Cole
predictions and the actual numbers when measured was about the lowest of
all the competring methods (Diamond, Kiesel, Goss, Frank, Lipetz, Le Massena).
I'm sure Young and, in particular Cardew, wouldn't have placed too much
reliance on them.
(Did this info come from the 38-class book, by the way?)
Geoff Lambert