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Salt flat laser experement

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slimp1

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Salt flat laser experement
« on: December 12, 2021, 08:41:41 AM »
Bonneville salt flats 12 miles = 8' earth curve.
Level laser for 1 mile. the end of the flats the beam should be 8' above the starting point.
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Lorddave

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Re: Salt flat laser experement
« Reply #1 on: December 12, 2021, 09:25:19 AM »
Be sure to account for atmospheric refraction.
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faded mike

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Re: Salt flat laser experement
« Reply #2 on: March 19, 2022, 06:17:44 PM »
 I think rowbotham said refraction is 1/6 i think that 1/6 of the final answer as in 1/6 of the calculated curvature. Can anyone clarify?
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"Using our vast surveillance system, we've uncovered revolutionary new information..."
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theoretical formula for Earths curvature = 8 inches multiplied by (miles squared) = inches drop from straight forward

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Curiouser and Curiouser

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Re: Salt flat laser experement
« Reply #3 on: March 19, 2022, 08:06:53 PM »
Quote from: slimp1 on December 12, 2021, 08:41:41 AM
Bonneville salt flats 12 miles = 8' earth curve.
Level laser for 1 mile. the end of the flats the beam should be 8' above the starting point.

Wow. Really bad at math AND physics.
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Stash

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Re: Salt flat laser experement
« Reply #4 on: March 19, 2022, 10:07:34 PM »
Quote from: faded mike on March 19, 2022, 06:17:44 PM
I think rowbotham said refraction is 1/6 i think that 1/6 of the final answer as in 1/6 of the calculated curvature. Can anyone clarify?

Is this what you mean:

ENAG:

"The preceding remarks suppose the visual ray C. B. to be a straight line, whereas on account of the unequal densities of the air at different distances from the Earth, the rays of light are incurvated by refraction. The effect of this is to lesson the difference between the true and apparent levels, but in such an extremely variable and uncertain manner that if any con- stant or fixed allowance is made for it in formule or tables, it will often lead to a greater error than what it was intended to obviate. For though the. refraction may at a mean compensate for about a seventh of the curvature of the earth, it sometimes exceeds a fifth, and at other times does not amount to a fifteenth. We have, there- fore, made no allowance for refraction in the foregone formule.”

Or this:

"The only modification which can be made or allowed in the preceding calculations is that for refraction, which is considered by surveyors generally to amount to about 1-12th of the altitude uf the object observed. If we make this allowance it will reduce the various quotients by 1-12th, which is so little that the whole will substantially the same."
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Bullwinkle

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Re: Salt flat laser experement
« Reply #5 on: March 19, 2022, 10:29:26 PM »
Quote from: slimp1 on December 12, 2021, 08:41:41 AM
Bonneville salt flats 12 miles = 8' earth curve.
Level laser for 1 mile. the end of the flats the beam should be 8' above the starting point.
   


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