U.S. Navy WWI Submarine Capabilities

[ranger_24]

I'm researching hydrophones in use in WWI. I know the British submarines had hydrophones that they could deploy from their submarines, but I don't know about the U.S. Navy N-type submarine? Does anyone know about this, or can anyone suggest a good source?

[Aktungbby]

ranger_24!:Kaleun_Salute: http://www.dosits.org/images/dosits/Lasky5.jpg

World War I Type SE-4214 (SC) sound receiver as it was installed on a U.S. submarine. Lasky, 1977 http://eprints.maynoothuniversity.ie/4741/1/PhDThesis_AhmedKI_March2012.pdf (http://eprints.maynoothuniversity.ie/4741/1/PhDThesis_AhmedKI_March2012.pdf) If a 'coastal' N type even had one it would be this type.