Edinburgh University, "official eavesdropper" during the war, related some interesting experiences when opening an_ exhibition and demonstration of wireless telegraphy and telephony. He told jhow, with the enormous improvement upon the early receiving apparatus, it became possible to hear every whisper that passed along the North Sea, and they developed an efficient system of directional wireless.
If a Zeppelin was crossing the North Sea and it made a wireless signal, before many minutes the position of the airship was plotted on a chart in his office. We got our directional system perfected before the Germans, and then we watched the Germans doing it. It came to this, that a Zeppelin would make a signal asking her own side to tell where she was. Her own side would do this, and we would hear it, although we knew it already. Hi is staff became so very expert that they could recognize the very accent of the sender.
ery ship had its own call ignals—two letters.
From time to time the ship call signals were chenged. That was part of the game of war. It was very import-wut for them to know if the Germans changed their call signs, and to know to which ship a sign belonged. The operators became clever that they would come and tell him—"The man who was sig-nailing DQ is now sending IS." They could tell by the manner jand accent of the operator on the key.
Text read from the printed page and cleaned; old type leaves the occasional error.