In message
Sam Wilson wrote:

In article ,
rail wrote:

In message
D7666 wrote:

But we will see a green navigation light on the right wing won't we ?

Or will they make it blue ?

It's*only the yellow filter on the window that makes it appear green...

I note that railway practice includes putting a blue(ish) filter in
front of a yellow(ish) light to make a green signal, but in general a
properly yellow filter in front of a properly blue light would appear
dark.


There's always someone who has to bring reality into the discussion :-)

I was actually (deliberately) confusing additive and subtractive colour
mixing. I hadn't realise there was a proper railway connection.

--
Graeme Wall

This address not read, substitute trains for rail
Transport Miscellany at www.greywall.demon.co.uk/rail