Hello Frank,
Were Bill still with us he could expand on his reasoning. He would
have hugely enjoyed this thread.
He did write, "The only thing to watch out for
is a case where the thicker post casts its shadow
on top of that of one of the cross bars. I suppose
it might be good if all three rods were the same
diameter, but that would be harder to make."
But I don't recall any mention of subdued sunshine (sunlight
diminished by haze or thin clouds) as being a complication. Isn't it
odd that so little has been written, prior to now, about the effects
of weak sunshine on gnomon design.
I'm hoping that, once this thread has run its course, you will write
a summary, which will clearly state the best nodus design options
available. You have a gift for writing clear statements.
Best wishes,
Mac Oglesby
Dear Mac,
Thank you for sharing Bill's sketch with the list.
I really appreciate his phrase...
I'm a bug on symmetry...
I think that pretty much describes me too!
Moreover, his design satisfies the symmetry goal well.
In particular, the fat rod extends beyond the crossing
which keeps me happy!
The main snag is that the relatively thin rods might
disappear into fuzz when the main shadow is long,
especially when there is light haze.
Frank
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