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NO Relativity Theory needed for GPS
On May 17, 7:09*pm, NoEinstein wrote:
On May 16, 5:06*pm, Eric Gisse wrote: On May 16, 1:28*pm, NoEinstein wrote: [...] Dear Jerry: *You are obviously mentally ill. *You wish to "harp" like an expert, but your mind is closed to the "perfection" of anything. Bubble levels are quite accurate enough for my "yes or no" experiment. *Make your own interferometer and see if you can get it into the Smithsonian for contributing anything to science. *— NoEinstein — What would you say the accuracy of a bubble level is, in terms of degrees? Eric: I used a Stanley carpenters level. *Most door frames must be plumb to within 1/16" in 6'-8" of height. *You calculate the angle, if you can. *Ha, ha, HA! *— NE — Oh dear. The best carpenter's levels attain a precision of 0.5 mm per meter, according to manufacturers, about 1 part in 2000. But that is not to an offset grid marking -- that precision is about a factor of 4-8 worse -- it is what a sharp eye can possible detect. Given that John Armistead's vision is shot (ask him about the difficulty he has reading the screen), it's not likely he'd be able to accomplish this. Secondly, the Stanley levels are not of this class. Third, the precision one would obtain would depend on the length of the level as well as the length and straightness of the surface against which the level would be applied. Given that the lever arm of the apparatus he touts is nowhere near a meter, let alone 6'-8", he can't quote the precision of 1 part in 1200 that he has here. |
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