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On Tue, 27 Oct 2009 15:35:52 -0600, QMCM  wrote:

> It was in thanks for using
> several of my articals and introducing The Franklin Piloting, The
> Graduated perpendiclar bisector, for the three point problem (Sextant)

I read your message #9304, but did not see any of the diagrams.  My only
Bowditch is 1995.

I'm interested in resecting my position from three points, mostly from the
plane table.  I hadn't seen any instrument that would make it easier,
other than a three arm protractor or purpose drawn intersecting angle
chart overlays.  Protractors are getting a bit expensive.  Is a picture of
your bisector available, with instructions?

Trial and error in making the triangle smaller on a plane table map is
pretty quick, if you understand the direction and amount each line will
move when rotating the table for a new round of sights.  Two rounds
usually gives a very good position, +/- 2 or 3 hundredths of an inch on
the map; depending on the "goodness" of the angles to the reference points.

--
Richard . . .

Using Opera 9.2.4 after the "Dog" died

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