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To: nw_arizona_granny
Bob was showing me that they set up the boxes (about the size of a cereal box, that beamed light and hit something on the modified tractor, so that the farm field could be leveled to a fraction of an inch. It helped with the irrigation water.

It's just a LASER leveling device. The "box" has a laser pointer spinning on a turntable. You level the turn table and the pointer traces a perfectly level plane. The modified tractor uses a sensor to lock onto the plane produced by the spinning laser pointer. That gives a constant height reference over the entire field. The constant reference can be used to drive a perfectly level plowing of the surface or an intentional slope to permit drainage in a desired direction.

3,881 posted on 02/17/2004 6:49:45 PM PST by Myrddin
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To: Myrddin
Thank you for explaining how it really works.

A prayer and a hug to your Marine, please thank him for me, for all that he does and risks.

Granny
3,889 posted on 02/17/2004 8:00:30 PM PST by nw_arizona_granny (Where are the terrorists hiding? (Now that would be a good search at Google.com)
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