Norman Billingham wrote:
wrote in message
oups.com...

Laser levels - why not just use string?


Highly advanced mathematics:

No force on earth however great
Can stretch a string however fine
into a horizontal line
which will be absolutely straight

I read a long time ago, that if a fly lands on a horizontally installed
steel girder, the girder will sag from the fly's weight. Of course, the
sag can only be measured with some very expensive equipment that none of
us possess.

-
Bill
In Hamptonburgh, NY
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