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Path: utzoo!linus!philabs!cmcl2!harvard!talcott!wjh12!biomed!lagasse
From: lagasse@biomed.UUCP (Robert C. Lagasse)
Newsgroups: net.rec.boat
Subject: In-Hull Transducers
Message-ID: <139@biomed.UUCP>
Date: Mon, 28-Oct-85 11:18:37 EST
Article-I.D.: biomed.139
Posted: Mon Oct 28 11:18:37 1985
Date-Received: Thu, 31-Oct-85 22:27:47 EST
Organization: Mass. Gen. Hosp. - Dept. Biomed. Engineering
Lines: 12


      Steve Shelley asked about an inside mounted transducer for a depth
sounder in a previous article:

     Steve, I have seen advertisements in several boating catalogs for a
small clear plastic dome with a lip around the edge which gets screwed
and/or glued down to the inside of your hull.  The dome is inverted.  The
transducer is placed inside the dome.  The dome is then filled with a fluid,
mineral oil I think.  This fluid couples the sound waves from the hull to
the transducer.  I do not know how well they work.  I believe you have to
use a different transducer than the type that gets mounted on the transom,
but maybe not.  You should consult a local marine electronics installation
person for more help.