22 Feb 98 11:32, Jay Hanig wrote to Hal Hanig:
 JH>>> My understanding was that it was most definitely a one way device.
 JH>>> Sometimes the message would get stuck in the tube and the instructor
 JH>>> would have to hold his end out into the slipstream to be sure the
 JH>>> student was getting the message.
 HH>> I always wondered why my primary instructor wore a whistle around his
 HH>> neck during flights.  One very dense day, I found out!!!
 JH> You had dense days?
Moi?  Mais, certainment.  You didn't??  Tell me another one while I pull on 
my Wellies!
Hal
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