Don't forget Ron, Tudor had the advantage of his trombone, using the
slide
he would have had the advantage of 'feeling ahead' thus skewing his
perception of visibility.

I personally remember in 62 not being able to see my frant garden gate from
the street door , which was about 20 feet.- Hide quoted text -- Show quoted text -

Ten visibility at night is effectively nil, but is ten yards
nevertheless.
I didn't play the 'bone until 1992; in those days it was the piano
only, as befits a lttle boy from a respectable suburban family. :-)

Tudor Hughes, Warlingham, Surrey.