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Hi Listers:
I think that I found two ways to improve the design
of cone nodi so that their shadows are easier to read and more precise. I
noticed this problem with long shadows produced by narrow sharp cone
nodi:
The sharp tip of a narrow cone nodus casts
a shadow that is invisible when the shadow is long, giving a false sundial face reading for the location of the tip's shadow. In other words, the shadow was too short. To correct this problem, I think that blunting
(rounding off) a cone's sharp tip
so that its diameter is equal to the minimum diameter of the nodus nearly eliminates the fuzziness of the tip's shadow and moves the nodus further down the cone's long axis. Widening the base of the cone decreases
the amount of blunting needed. Conclusion: The best cone nodus is wide and
blunt.
Please look at this drawing that shows an example
of this design modification. Does this solution make sense and
seem reasonable?
thanks,
John
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