Show shows direction of cf sound y A machine has been recently granted a patent by the united states patent office covering a method of 0 determining the direction ot of a sound wave or 0 of locating a source of sound Boun dand and t in doing this the waves emanating irom from such source are divided and the divided parts are compared by brilli ing first one part and then another anothy through a common conductor r I 1 aie a employs an apparatus including avid diametrically opposite receivers alig the direction of 0 the source of 0 the sound I 1 waves being determined by stop stopping pilli ono one ot of the said receivers thus indicate ing into which ot of the receivers thi th garti cular sound wave was received |