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Rh which brings any portion of Ireland within danger is number 1, that is to say, the French coast from Cherbourg westward. Under all conditions the region of the North Channel, including Belfast and the Clyde, and extending as far as the Naval Station at Rosyth (R on the map) may be taken as out of range.

Fig. 21.

In addition to the above, the nearest point situated on the German frontier, taken to be Dusseldorf (D), has also been considered a centre of danger, and an arc of 400 miles inscribed. This brings such important centres as Newcastle, Liverpool and Manchester, Bristol and Weymouth, almost, but probably not as an actual fact