PENETRATING POWER OF THE HUMAN VOICE.
A SCIENTIFIC paper published in London states that 18 miles is the longest distance on record at which a man's voice has been heard (without telephonic means). This occurred in the Grand Cañon of Colorado, where one man shouted the name "Bob" at one end, and his voice was plainly heard at the other end, some 18 miles away. Lieutenant Foster, on Perry's third Arctic expedition, found that he could converse with a man across the harbor of Port Bowen, about one mile and a quarter distant; and Sir John Franklin said that he conversed with ease at a distance of more than a mile. Dr. Young records that at Gibraltar the human voice has been heard at a distance of ten miles. — Voice.