These microphones, it is believed, are usually arranged in a semicircle. Each instrument records sound waves best when they come from one particular direction. The operator on shore, listening to a device that eliminates all other sounds coming in from under the sea, can tell by the way a passing submarine affects the different microphones in the semicircle how far off and in what direction it is moving, and so warns and summons the ever-watchful patrol boats. Air craft are doubtless being much used in the hunt for submarines, for an aviator at a height of several hundred feet can distinctly see a submarine swimming beneath him in clear water with a good light reflected from the bottom. Early in the war, the pilot and observer of a “Taube” that was brought down in the North Sea were rescued by a British submarine. In the attack on Cuxhaven a combined force of submarines, sea-planes, and light cruisers was resisted by the German shore-batteries, destroyers, “U-boats”, aeroplanes and Zeppelins. As the British sea-planes returned from dropping bombs on the Cuxhaven navy yard or taking observations above the Kiel Canal, some of them were shot down by the Germans but the aviators were picked up, as had been arranged beforehand, by English submarines. In the spring of 1915 there was an engagement between a Zeppelin and a British submarine in which each side claimed the victory. On August 26 of the same year the secretary of the British Admiralty announced: “Squadron Commander Arthur Bigsworth, R.N., destroyed single-handed a German submarine this morning by bombs dropped from an aeroplane. The submarine was observed to be completely wrecked, and sank off Ostend. [Illustration: Copyright, Illustrated London News & Flying. Photograph of a submarine, twenty feet below the surface, taken from the aeroplane, whose shadow is shown in the picture.] “It is not the practice of the Admiralty to publish statements regarding the losses of German submarines, important though they have been, in cases where the enemy has no other source of information as to the time and place at which these losses have occurred. In the case referred to above, however, the brilliant feat of Squadron Commander Bigsworth was performed in the immediate neighborhood of the coast in occupation of the enemy and the position of the sunken submarine has been located by a German destroyer.” “This is inexact,” replied the German Admiralty. “The submarine was attacked but not hit and returned to port undamaged. One of our submarines on August 16 destroyed by gunfire the benzol factory with the attached benzol warehouses and coke furnaces near Harrington, England. The statement of the English press that the submarine attacked the open towns of Harrington, Parton, and Whitehaven is inexact.”