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Several years ago at a dive show, I noticed a simple gadget that allowed a
diver to talk underwater. There were no electronics involved. The device was
simply a plastic tube, about 6" long & 2" in dia., with a small bellows housed
inside. You were supposed to take a breath from your regulator and then remove
the reg and put the tube up to your lips and talk for as long as possible on a
single breath. The concept was that sound will travel well in water if you can
get the sound waves to initiate. The bellows provided a vibrating surface that
was not disturbed by exhaled bubbles. After talking for one breathful, you
then pushed the bellows (which have now inflated out of the tube) back into the
tube & could have another go. It was claimed that you could hear quite clearly
over several metres.
I didn't buy the gadget at the time because I thought
- does it work ?
- looks expensive for what it is !
- it's just one more bit to clip on to the diver to add to the
'christmas tree' effect
However, on reflection it has now occured to me that whilst I would never take
something like this diving, it might be very useful for pool training & could
save trips back up to the surface just to say a few words.
1.Does anyone know what I am talking about ?
2.Has anyone used this gadget ?
3.If so, does it work well ?
4.If 'yes' to 1, 2 & 3...any idea of who makes this gadget & where to get one ?
Please email any reply directly to me as I am no longer subscribing to this
List (too much traffic !).
Regards, Steve M.
**************************************************************************
* Dr. S. G. Millard, * E-Mail : ec96@li*.ac*.uk* *
* Senior Lecturer, * *
* Dept of Civil Engineering * Tel : 0151 794 5224 (UK) *
* University of Liverpool, * 44 151 794 5224 *
* PO Box 147, * (International) *
* Liverpool L69 3BX, * *
* UK. * Fax : 0151 794 5218 (UK) *
* * 44 151 794 5218 *
* * (International) *
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