I *really* like this scheme. Very clever...
Jim
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| Jim Cobb | 540 Arapeen Dr. #100 | [EMAIL PROTECTED] |
| Parametric | Salt Lake City, UT | (801)-588-4632 |
| Technology Corp. | 84108-1202 | Fax (801)-588-4650 |
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You know when you're sitting in a chair and you lean back so you're on
just 2 legs and you almost fall over and at the last second you catch
yourself? I feel like that all the time.
-- Steven Wright
"Ron Anthony" <[EMAIL PROTECTED]> wrote:
> All,
> I'm sorry I was only half awake when this thread started so forgive me if
> I'm off course. If I had to lay out a large dial (say 100 ft) to a high
> degree of accuracy (say .1 of an inch) I would plot all the points not as
> x,y co-ordinates. I would plot them all out as the intersection of two
> lines from two fixed points.
> To see what I mean pick 2 points that are well established, e.g., point A
> where the gnomom meets the dial face, and point B some number of feet due
> north (in line with the gnomon base) of point A. Every point on the dial
> face is now at the intersection of two tape measures that start at points A
> and B. Assuming that the dial face is flat the accuracy would be good as
> the tape measures used. For the points that are almost inline with the AB
> line, a third point C could be used as one of the points. Point C could be
> calculated from points A and B. Of course the computer would have to
> calculate all of the points for you.
> As a crude ASCII art: Point X is 30" 1 1/4" from point A, and 22" 3 7/8"
> from point B. (A metric tape measure would be a lot handier)
> B
> \
> \
> \
> \
> \
> / X
> / C
> /
> /
> /
> /
> /
> /
> A
