Thread: Laser levels - why not just use a ball of string?
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Harlan Messinger Harlan Messinger is offline
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Default Laser levels - why not just use a ball of string?
wrote:
Tony Bryer wrote:

... The jetty is one of the longest of its type in the world, extending for
5.6 kilometers and dipping 1.2 meters over its length as it follows the
curvature of the earth.

Hmmm. I woulda thunk half that, ie r-sqrt(r^2-2.8^2), where r = 12,756.3 km.

That's the earth's diameter, 2r.
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