🚀 go-pugleaf

"mark_newton" <mark_newton@optusnet.com.au> wrote in message
news:4282EA40.4060109@optusnet.com.au...
> Hunslet wrote:
>
>  > This particular photograph shows 3801 to be quite a dark gray, whilst
>  >  other black and white photos suggest that the gray is considerably
>  > lighter.
>
> Streamlined 38 nearing completion at Clyde Engineering:
>
>
http://images2.fotopic.net/?iid=y86vdw&outx=599&quality=70&original=1&noresize=1&nostamp=1
>
> This photographic print from my collection, while damaged, shows a light
> shade of grey, as evidenced by the highly visible dirty hand marks
> around the nose shroud, and along the edge of the valance.
>

There is no evidence this is the final coat of paint expert. Probably just
undercoat.

> Well known photo of two 38s in grey at Eveleigh:
>
>
http://www.records.nsw.gov.au/BOSImages/Series/0017/420/Items/0222/484/17420_a014_a014000220.jpg
>


> Again, the grey is quite light on both locos. Three distinct variations
> in tone can be seen, all of which appear lighter than the gunmetal wagon
> colour.
>

Again a locomotive before being finally painted. The black and white print
is useless to determine what shade of grey was used.

> For comparison, a photo of an LHG in gunmetal lacquer:
>

Irrelevant, as black and white prints show the same grey in a large range of
grey tones. The colour print on my web page of a steel S wagon is a
different grey, showing the BW print to be useless for colour matching.

>
http://images1.fotopic.net/?iid=y86vdv&outx=578&quality=70&original=1&noresize=1&nostamp=1
>
> There is a well documented technique used by aviation historians to
> determine the approximate colours of WW1 aircraft by comparing grey
> scale contrast. Perhaps this method could help identify the shade of
> grey used on the 38s?
>
>
>
>

How do they calibrate the grey scale? What reference standard do they use?
Until you apply a proven technique to suitable prints, your examples tell us
nothing about the colour used in service.
-- 
Terry Flynn


http://angelfire.com/clone/rail/index.html

HO wagon weight and locomotive tractive effort estimates

DC control circuit diagrams

HO scale track standards