Show GAUGES OCEAN DEPTHS WASHINGTON Nov Nor 25 Dy By ByThe ByThe The Associated Press Sound Sound echoes tra traveling cling up from the ocean bottom in measured hereafter will guide both the tho mariner feeling his way through fog log or night Into harbor and the government coast surveyor plotting ocean depths Director E. E Lester Luter Jones of at the coast coa t and geodetic survey in his annual report the sixth ninety of at tho the service today announced tho the perfection of the determining depth device and ex ex- explained explained ex- ex explained the proficiency which has hu been attained with it The as the instrument used is called sends Bends out a a. series of ot sharp harp rapping noises from the ships ship's bottom hes hee the rap echo which resounds from the ocean bottom and by calculation of ot the time consumed In the tho emission and return of af the tho sound reports report the exact depth of water under the ship at the tho moment moment- It works at ata ata ata a high speed reporting the depths as 81 frequently as tour four times per second even while the vessel ves-el on which it 1 Is mounted steams alon along at full speed |