I made the calculation for the hourlines and datelines for a sundial (6.50 m x 3.30 m) on a concave cylindrical wall in Brussels (Belgium). The sundial is situated 16 m high. (See low resolution picture)I am in search of other sundials on a concave cilindric wall. Willy LEENDERSHasselt Flanders (
Dear Willy,
That is an interesting sundial...
> I made the calculation for the hour lines and datelines
> for a sundial ... on a concave cylindrical wall...
When I first heard about this project, I imagined that the
nodus would be hidden in shadow for most of the day by the
wings of the wall.
N
Dear Frank,When I calculated the sundial for this wall there was no wall at all.It is a new building.The cylindrical wall consists of elements of smooth concrete. The hourlines and datelines are grooves formed according to my calculations during casting the elements. I started with the measurements
Hello Frank,
Would you be willing to expand on the eight steps you listed in your
procedure for dealing with a supposedly flat wall? I know how to do
number 1, but have little idea how to deal with most of the other
steps.
I fear I've been guilty of mostly assuming that whatever wall I was
Dear Mac
Many thanks for your message...
> Would you be willing to expand on the eight steps
> you listed in your procedure for dealing with a
> supposedly flat wall?
Yes, I am willing but this is a bit of a risk! Each
step could be a whole chapter of a book! I don't think
the list would be to
I
am in search of other sundials on a concave cilindric wall.--
Dear Willy,
in the year 2001, with the mathematical help of Gianni
Ferrari, I made a sundial un a semicilinder surface.
The dial is inside a fountain, and it works in a
different way of an u
Hello Friends,
The Compendium for September 2004 (vol 11, number
3) p. 11-17 has an article by Gianni Ferrari with
a lot of information about Mario's sundial -- see
Part 2, "Sundial With Hour Windows."
Best wishes,
Mac Oglesby
--
Dear Willy,
in the year 2001, with t
Hello Frank,
Thank you for your illuminating comments. It is very kind of you to
share your knowledge.
By all means please consider doing a book! I'll buy the first copy.
In any event, please continue your thoughtful emails. Text-only
messages are quite small, and easily deleted by those wh
Hello
Willy,
I am
surprised no one mentioned the article in the latest NASS Compendium (Sept 2006)
"Towering Timepiece" by Howard Hebel, the architect for renovation of
Engleman Hall at Southern Connecticut State University. Fred Sawyer was the
gnomonic consultant for the sundial inside
