John,

On Fri, 30 Jul 2004 08:33:03 -0400, John Ferrell wrote:

> I think you just described a sonic delay line. IBM was using these for
> storage in the late 60's with lengths up to about 500 ms. That size was
> touchy, the 50 ms units were rock solid.

I think you're wrong there - I believe they were filled with mercury, so were anything but solid!  :-)

Cheers,


Howard Winter
St.Albans, England

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.