THE INTERNATIONAL CODE OF SIGNALS 657
Q flag over L flag (Q L)—signifying "My ship is 'Infected,' i e , I have had
cases of infectious diseases less
than five days ago."
By Night.
Red light over a white light—
signifying ... "I nave not received free pratique."
(Only to be exhibited within the
precincts of a port. The lights
should not be more than 6 ft.
apart.)
DISTRESS SIGNALS
(International Convention for Safety of Life at Sea, Convention
for the Regulation of Aenal Navigation.)
When a vessel or aircraft is in distress and requires assistance, the
following are the signals to be used or displayed either together or
separately:—
In the Daytime.
(1) A gun or other explosive signal, fired at intervals" of about a
minute (for vessels only).
(2) The International Code Signal N C9 signifying: "I am in distress
and require immediate assistance."
(3) A continuous sounding with any fog-pgnal apparatus; in the
case of aircraft, sound apparatus.
(4) The signal SOS made by Radiotelegraphy, or by any other
distance signalling method.
(5) The distance signal, consisting of a square flag having either
above or below it a ball or anything resembling a ball.
For aircraft -only:— , *
(6) The signal consisting ol a succession ot white lights projected
into the sky at short intervals.
(7) Th$ International distress call "MAYDAY" (corresponding to
the French pronunciation of the expression "m'aider") by
means of Radiotelegraphy.
At Night.
(1) A gun or other explosive signal, fired at intervals of about a
minute (for vessels only).