Re: [gingery_machines] Chord height Was new article: Making it Dead Flat and Square

 

Water is not quite flat. For a 1000 foot chord, the diagonal of the base,
the chord height due to the curvature of the Earth is nearly 0.1 inches. (1
part in 120,000 - half the error budget for 1/8 inch in 700 feet.) The point
I'm trying to make is that 1 part in 1000 is difficult, 1 part in 10000 is
tough and 1 part in 100000 is messing with physics.

Dick
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