Ed,
You are absolutely correct. The measurer must be within the plane of the
parabola and the eye of the measurer is the origin of the Cartesian coordinate
system that includes the limb. In this case, points above the origin yield
positive Y values, but points on opposite sides of the origin have signs in
terms of the X values. This is a point I didn't address adequately in the
description. I should explain the sign change. Every thing works out when these
conventions are followed. It is a darn good thing that you are willing to run
interference and interpret for me. Thanks again.
As a fianl comment, the system only works for limbs that lie within the
same vertical plane.
Bob
-------------- Original message --------------
From: "Edward Frank" <[email protected]>
Bob,
Looking at your diagram there are a coupe of practical notes that must be made.
First the distance and angle measurements must be taken from a point in the
plane of the parabola, i.e.. under the limb.
Question:
Looking at the illustration I see that angle 1 (a1) is in a different direction
than are a2 and a3. Is this accounted for in your calculations? Need it be
listed as an angle > 90 degrees. In the diagram, must you be to the left of
point d2. How do you deal with the different points being on the opposite side
of the person making the measurements?
Ed
"The most beautiful thing we can experience is the mysterious.
It is the source of all true art and all science." - Albert Einstein
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