Considerable interest has been aroused in Liverpool by demonstration of the working of am invention for use in ships, particularly in time of fog, to show the direction of sounds such as those of the sirens of other chip:
The apparatus, which is the invention of two brothers named Hodgkinson, consists of "drum" to receive the sound waves and an in-dicoter. The "drum," which is 9ft. by 5ft., is placed aloft, where it cannot be affected by sounds on the deck, and it is connected electrically with the indicator, which is placed in such a position that it can readily be seen by the ship's officer on duty. The receiver consists of a number of units, each of when receives sound waves from & parti-
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