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to the hull. In a hole cut through the liner.
From Pete's comments, now I figure the powder around the transducer is sawdust from cutting through the liner.
I think I have this type of transducer (see website below). With a base/cup mounted to the hull and the transducer in a "liquid". (The PO was a well off doctor and the equipment he added seems to be high quality).
http://www.airmartechnology.com/airmar2005/ex20/RMProducts/ElectCat.asp?ProdID=32&Man=All&PageNo=59
http://www.airmartechnology.com/
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