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On 1/20/2017 3:58 AM, Bill Lion heart wrote:
> Suppose you got a 30m room and a ruler calibrared in mm at one end. Then
> point a well collimated laser from one end of the ruler to the mirror on
> the sextant (horizontal on a table) so reflected a spot on the ruler.
> 1mm would be approx 0.1 minute. Take the average either side of the dot
> and use arc tan on your calculator. Depending on the length of the ruler
> do the full arc in several stages.
>
> Would that work?
>
Good thinking. A decade or so ago Frank proposed a method with a
sextant, simple laser pointer, a table and a long hallway. Besides
mirror alignment, errors along the arc and collimation there are other
ghosts in the machine. Eccentricity of the micrometer drum being one of
them. Frank also devised a test for eccentricity.

Frank has presented several inventive and creative tests for all of the
above a decade or so ago (to present), many of which Alex and I pursued.
Based on his recent posts, I feel confident Frank has not lost his
intellect, memory--or wry sense of humor. I'm feel confident he can
direct you to the archived articles if he so chooses.

Regarding a wry sense of humor: An "outrageous" hyperlink/click-on in
one of his posts to a URL of an article on outrageous click-ons and
psychological evaluations was not lost on me. But more than the, "One
step from traditional navigation" limit? ;-)

   

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