W .--
P .--.
J .---
I ..
U ..-
F ..-.
S ...
V ...-
H ....
T -
N -.
K -.-
C -.-.
Y -.--
D -..
X -..-
B -...
M --
G --.
Q --.-
Z --..
O ---

The signal to attract attention at starting and to signify the
end of the message is .. .. .. continued until it is
acknowledged with a similar sign by the other observer; that
for a repetition is .. -- .. which is signalled when any part
of the message is not understood, otherwise after each word is
signalled the receiver waves - to indicate he understands it.
Until proficiency is attained, two copies of the alphabet