Re: [Phys-l] What think youall of this:

[Bernard Cleyet <bernardcleyet@redshift.com>]

For such discrimination the Michelson method is necessary; massive slab 
floating on mercury.

bc, Panzer.

But, the experimenter did try doing the experiment over time using the 
earth's rotation and revolution to effect the necessary movement.  
However, being lazy, I didn't read the text carefully.

Brian Whatcott wrote:

> At 03:05 PM 9/14/2007, you wrote:
>  
>
> > http://www.sas.org/tcs/weeklyIssues_2007/2007-03-03/project1/index.html
> >
> >
> > bc, has no comment, yet.
> >
> >
> > p.s. some comments:
> >
> > http://www.sas.org/tcs/weeklyIssues_2007/2007-04-06/project2/index.html
> >    
>
>
> Good for the physician!
>
> In speculating about error sources, I  discounted  differential bending of
> the wooden beam with rotation  when swung on a vertical axis because it was
>  reported that an iron tube provided much the same result.
> However, swinging the beam on a horizontal axis appeared to give
>  much greater offsets.   This would support the idea of greater bending
> with beam horizontal than vertical. However, the effect would be more
> sinusoidal, one supposes.
> The next suspect is the accuracy of ball race at the rotational axis.
> Suppose that comparing two angular positions provides a circumferential
>  offset from the horizontal plane in which the beam rotates
>  of 0.1 mm in 3 meters - an angular error of about 1 second of angle.
> This is a plausible bearing error.
> Both error candidates are avoided by fixed  mounts oriented N-S
>  for laser and ccd
>
> However,the experimenter reports no variation for this arrangement.
>
>
>
> Brian Whatcott    Altus OK    Eureka! 
>
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