Edgerton's Boomer seabed mapping device

[noonesomeone]

Edgerton's Boomer is a device used in oceanography to map the seabed, or find ship wrecks.

Some background to the electrical engineering theory can be found here - << Link removed by berkeman -- please see NoTime's links below for references >>

 

[NoTime]

Your link is ambiguous at best.
Are the following links what about what you are referring to?


http://stinet.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=AD0639199

http://web.mit.edu/6.013_book/www/chapter10/10.2.html