WW2 active sonar could only project a beam in one single direction at a time, and the range was limited. Hydrophones can also only listen in one direction at a time, but a sweep with the hydrophones will let the operator hear anything the device is pointed toward, and they have a much longer range.
http://www.maritime.org/fleetsub/sonar/chap1.htm#1A
I do have a book on sound propogation and underwater studies, but unfortunately it is in storage along with the rest of my library. I keep trying to get all my books into my apartment, but with no luck.
Quote:
Originally Posted by Hinrich Schwab
To those willing to help, please do not give me a Wikipedia link as they are not acceptable to me regarding true academic research.
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I find that just a little bit snobbish. When properly sourced, Wiki articles can be a valuable tool, sometimes containing information not found in any other online source. Any online source can be tainted, and none are to be trusted fully. This also goes for many published books, which are also considered "not acceptable" by most true academics. If it isn't a primary source it can't be fully trusted, and even they should be cross-researched.
I agree that any online reference should not be used unless proper sources are cited, but that holds true for any website, not just Wikipedia.