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RE: laser levels

Subject: RE: laser levels
From: Mark Andy <>
Date: Mon, 22 Aug 2005 16:48:05 -0400 (EDT)



What makes it worse is that my wife is a physics professor...




On Mon, 22 Aug 2005, Mullen, Tim (IIS) wrote:

> Mark Andy
>> You've got a water level, with all its tubing, on a
>> table.  The two ends are held up against a wall and
>> you mark where the water is.
>> Next you take all the tubing on the table and drop
>> it on the floor.  The water level just got lower
>> (on both ends), right?
> Nope.  The volume of water in the tubes is exactly the same, so the
> water level doesn't change on the ends.  If you raise and lower the
> entire "system", including the ends, then things change.  But water
> always "seeks its own level", so if you fix one end, the water level at
> the other end will always be level with that end.
> Mark both ends of the tube when they are next to each other.  Attach one
> end to a fixed post, and move the other end around. if the other end is
> physically lower, the water will be higher in that tube and lower in the
> fixed end, but they will be even.  Raise the moveable end until the
> water is at the mark, and it will be at the same level as the other end,
> and the two marks will be level.
> No matter what the water is doing in between, the water level in the
> ends of the tube will be level to each other.  Raise and lower the
> movable end until the marks line up and you will have level marks.
> Here's one write up: <>
> Tim Mullen

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