Let it get from here to Germany, as it will do, eh?
and a Zeppelin coming across England on a favourable night could make things hum in Cardiff." Hillyard laid the sketch down and took another which Fairbairn held out to him.
"Do you see this ?" Fairbairn continued.

"This gives the exact line of the nets between the English and the Irish coasts, and the exact points of latitude and longitude where they are broken for the passage of ships, and the exact number and armament of the trawlers which guard those points." Hillyard gazed closely at the chart.

It gave the positions clearly enough, but it was a roughly-made affair, smudged with dingy fingers and uneven in its drawing.

He laid it upon the table by the side of the map of Cardiff and compared one with the other.
"This," he said, touching the roughly-drawn map of a section of the Channel, "this is the work of the ship's captain ?" "Yes." "But what of this ?" and Hillyard lifted again the elaborate chart of Cardiff by night.

"Some other hand drew this." Fairbairn agreed.
"Yes.