Posted by John Wilson on September 29, 2005 at 08:01:20 from 202.154.157.202 user hugo.
In Reply to: A new theory concerning Captain Flint's elephant flag posted by Andrew Craig-Bennett on September 27, 2005 at 17:52:02:
If you are Red/Green Colour Blind you can distinguish between Red and Green Lights while on watch and/or sailing by yourself by using filters of Red and Green glass/plastic which you insert between your eye and the Light that you are viewing. Takes a bit of time to do I suppose!