Face the station and wave the flags over the head to attract attention, making at frequent intervals the call letter of the station. When the station called is ready to receive the message, it answers by displaying its own call letter until the sender makes the "alphabetical" or "numeral," as the case may be. Then proceed with the message. At the end of each word bring the flags across the lower part of the body.
2. To call a ship:
Hoist International Code letter J and make code letter of ship; then proceed as in article 1.
3. To make a general semaphore signal:
Hoist cornet; all ships answer by answering pennant; then make signal.
4. At the end of the message extend the arms horizontally and wave the flags until the receiver answers in the same manner, showing that the message is understood.
Should the receiver miss a word, he signifies the fact by waving the flag over his head. The sender will then cease signaling and wave his flags similarly to show that he understands. The receiver then makes "repeat last word," or whatever he wishes to say.
Should the sender make a mistake, he will make the "error" signal until answered by the receiver with the same signal. He then proceeds with the message.
THE ARDOIS SYSTEM.
In using this system in connection with the Army and Navy Code, the red lamp indicates "1" and the white lamp "2." Four lamps are placed on a vertical staff and electrically illuminated to indicate the numerals of the Myer Code, which represents the letters of the alphabet. For instance, white-white, or "22," represents the letter "A," and white-red-red-white, or "2112," represents the letter "B," etc. In this system the lights indicating the letters of the alphabet are read from the top downward.