Fig. 3. — Determining distance mom a Wireless Station equipped with Sound Signals. 



JL 



nr 



r .- n. 



"%* 



12 ll 



Symbols and Abbbeviattons. 



. traok of U.S. S. ' Washington.' I B submarine hell. 



• distance determined by whistle. j W steam fog-whistle. 



distance determined by submarine bell. | Int interval. 



JL 



nr 



am 



