CONVENTIONAL SIGNS FOR FLAG OR TORCH.[23]
To Call a Station.—Signal the "call letter" of the station required, or, if the call letter be not known, signal "A" without pause until acknowledged. The calling station will then proceed with the message.
To Acknowledge a Call.—Signal "I" three times followed by "front" and the call letter of the acknowledging station.
To Break or Stop the Signals from the Sending Station.—Signal "A" without pause until acknowledged.
To Start the Sending Station after Breaking.—Signal "G A" followed by "front" and the last word correctly received; the sender will immediately resume his message, beginning with the word indicated by the receiver. If nothing has been received, signal "R R"; the sender will then repeat all.
Error in Sending.—Signal seven dots (·······) rapidly followed by "front," and resume the message, beginning with the last word correctly sent.
End of Address.—Signal the period (··--··) followed by "front."
Signature Follows.—Signal "Sig" followed by "front."
To Acknowledge Receipt of a Message.—Signal "O K" followed by "front" and personal signal or initial of receiver.