"HFguy" wrote in message
news:hM67g.1131$Zf3.73@trndny01...
Grimly Curmudgeon wrote:

I fully agree that in some conditions a Morse tone will get through where
voice is an unintelligble mush, if heard at all, but apart from prisoners
tapping out messages on pipes its days as an *essential* comms tool are
pretty much over.

How do you send Morse code by tapping on a pipe when all you can send is a
'dit'?

By changing the spacing of the taps. taptaptap tap tap tap taptaptap