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4 ADMIRALTY TESTS OF SUBMA- RINE SIGNALING. The Submarine Signal Co., of Bos- ton, has recently put before the pub- lic the results of the British admiral- "THE MarINE. REVIEw its endorsement of a patented article that their consent in the present in- stance indicates their desire to sist the Submarine Signal Co. in curing the speedy adoption of an VESSELS OF THE BRITISH NAVY DETAILED TO CONDUCT THE REMARKABLY SUCCESSFUL TRIALS OF SUBMARINE SIGNALING, AT THE PORTSMOUTH (ENGLAND) NAVY YARD, NOVEMBER, 1906. 1. Royal Yacht VICTORIA AND ALBERT, fitted to 'receive submarine signals as a_ re- sult of the tests. to and including 16 miles. boats. 2, British armored cruiser, ANTRIM, which heard the submarine bell up 3. Holland Submarine, No. 1. onstrated that submarine signals are the only means. of 5. H. M. S. HARRIER and DRYAD, fitted to send and receive submarine signals. 4. Submarine B 11, which dem- communication with submarine 6. H. M. S. SPANKER, fitted with submarine bell, which sent long code messages to the ANTRIM, 5 miles distant. ty's comprehensive tests of submarine signaling. It is so unusual for the British ad- miralty to permit the publication of 'navigate in vention which, in the language of the admiralty report, will enable ships fitted with receiving apparatus "to fog -with almost as were conducted great' certainty as in clear weather." The following is taken from the admiralty report: The trials may be divided into three portions : I. To discover the utility of the ap- paratus as an aid to navigation. II. To discover its utility for signal- ing purposes. Ill. To discover its utility for sig- naling to submarine boats.* The trials were conducted with H. M. S. Spanker, fitted with a subma- rine signal bell of the kind usually fitted in' U. S. light vessels, and H. M. S. Antrim, fitted with two receiver tanks placed 20 ft. below the water line, containing microphones connect- ed by insulated wires with a switch- box in the chart-house, the switch-box being fitted with ear pieces. In the preliminary trials, which were conducted in Portsmouth harbor, Oct. 6,-the bell was kept at work for a whole afternoon, all. the ships at buoys and moorings reporting that the bell could be heard plainly except those which were divided from 'the Spanker by dry land or mud dry at low water. On Oct. 30 more exhaustive trials in which H.- M.S Niger was included in order that wireless communication might be kept up. in: case the bell should not: be rung. These tests were conducted with the vessels at various distances apart and the. Antrim- going at- various speeds, the first test being at a dis- tance of five miles. In this instance it was shown that by shifting the ves- sel to various points of the compass the vibrations on the port and _star- board sides could be made to indicate the exact direction of the signal bell with certainty, and this at a distance beyond the certain range of any of the aerial sound signals in use by light vessels in fog. The remaining experiments were conducted at distances of 7%, 10, 14 and 16 miles, In the test at ten miles distance and with the Antrim going five knots an interesting conclusion was reached. The Antrim was turned to bring the Spanker' to bear on the port beam, going 14 knots; the bell was heard when the Spanker -bore two points abaft the port beam, when it was abeam, and a little before the beam the note was very clear and musical. Speed was then reduced to five knots, and the ship allowed to » *The reports of the trials with submarines were altogether satisfactory; but since they re- late solely to naval use of submarine signal- ing they are not made public.