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

 

When I worked for a company that made fork lift trucks they had a new straight 1/ 2 mile long test track made and was it was laser leveled. They could not understand why a puddle of water collected in the middle when it rained.

Malcolm

I don't suffer from insanity I enjoy it!

--- On Sat, 1/1/11, R.L. Wurdack <dickw@nwlink.com> wrote:

From: R.L. Wurdack <dickw@nwlink.com>
Subject: Re: [gingery_machines] Chord height Was new article: Making it Dead Flat and Square
To: gingery_machines@yahoogroups.com
Date: Saturday, January 1, 2011, 6:56 PM

 

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

----- Original Message -----

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