SIGNAL CODES flash steady
and a
trifle
143
longer than one woiJd use with a
"ticker" for the sound.
"A"
is
the universal call signal and
another signal
known
is
is
always used unless
for the station call.
At sight of the call signal, the stations will turn on a steady stream of light and adjust their apparatus; when ready the called station will douse its glim, as the ancient sailors used
to say, in other words, shut off their light,
upon which the
other party will transmit his message.
Whenever anything goes wrong with the lamps
or re-
on a steady stream of lights and awaits a similar signal as an assurance that all is right and the talk may continue. Upon receiving the flectors of the sender the receiver turns
required assurance that light
and the message
The steady stream for
me
it is
all is right,
is
the receiver cuts
off his
continued.
of light
means
either wait a
minute
or I will wait a minute for you, according to the
way
used.
When
using any of the conventional signals as a question,
follow the signal with the "question mark," that
terrogation signal which
is
is
the in-
used in signalling as is the ? in the command to send faster, Q R
Thus if Q R Q is Q followed by the interrogation will mean, shall I send faster? writing.
The Ardois System The Ardois system
is
a display of four lights which are
Red light is a dot, while a white Usually these lights are electric bulbs swung
used as dots and dashes. light is
a dash.
from a mast, yard or pole of some kind. worked by a key -board.
The
last ten letters of the
in the Ardois system, thus
to
Z which stands
Wj W, W,
W
for
is
Q
The
lights are
alphabet are used as numbers is 1,
R
is 2,
S
is 3,
T is 4,
etc.,
naught or cipher.
known
as the cornet
and used as a gen-