On Tue, 02 Aug 2005 16:52:41 GMT, Gene Kearns
wrote:

On Tue, 02 Aug 2005 15:12:37 GMT, Shortwave Sportfishing
wrote:


That same technique was used on Hoover Dam. When we were out there a
few years ago, one of the documentaries we saw mentioned that
sometimes whole gangs of ten/fifteen men would continuously vibrate
the cement mixture for as long as 36 hours.

WOW..... I wonder how one judges the extent needed?

the bubbles stop coming up.

--
John H.
On the 'PocoLoco' out of Deale, MD