Art Carson wrote:
I agree.
We are talking about very precise hour line marks, however. To be accurate
to within 4 seconds of time the hole in the center of the hour line (and of
course the hour line itself) must be accurate to within 1' of arc. My
"free pin-hole technique" requires only
Bill Walton wrote:
> To get the desired accuracy the "pin-holes' themselves must be very
> accurately aligned (not true if the free "pin-hole" technique is used and
> the hole moved back and forth until the shadow of the gnomon is centered,
> and on the hour mark, at the same time)
They would no
Art, Daniel, Charles, and other Dialists,
I believe one could make a dial that could be read to a few seconds,
however I'm not sure of why one would want to be able to read a dial at any
time to this accuracy or precision. At most one might want such a dial to
be able to set a watch or clock, o
>Discussions here and experiments of my own have established that "shadow
>sharpener" techniques allow a shadow position to be read with accuracy on
>the order of one second of time. This led me to look for a configuration
>that allows a continuous readout with this type of accuracy, not just the
