A large sundial has been constructed as part of a war memorial for the
county of Du Page in Wheaton, Illinois, USA. See some photos of the
construction at : http://207.32.133.10/copy_of_veteranmemoria/home.htm
Dedication is to be this Monday, May 31, Memorial Day in the US.
Some details:
The
Hi John and other dialists
Perhaps a precise solution would be to calculate the intersection of the
hour line with the enclosing frame of your sundial. It must be done by a
computer but its easy to give a very good precision.
The result would be given as a length and a direction (north, east,
John,
I currently have a similar problem of helping to delineate a large dial,
this time a vertical decliner with a 17 foot gnomon which is to be carved
directly into the wall of a tower. Needless to say, the wall is not
absolutely flat.
My current solution has been to build a laser trigon
Friends,
It must be the rather dismal weather we are having at the moment!
Well, that's my excuse and I am sticking to it!
Tom Semadeni and Chris Lusby-Taylor both very politely pointed out
the fundamental error in my exposition of the 2-4 Law. Of course it
should have been INVERSELY
Hi John,
Here is a try:
John Carmichael wrote:
Snip
THE PROBLEM: The plotting techniques which use tabulated angles or
computation produce timeline plotting angles in degrees which the dialist
must mark onto the dial plate using a protractor. These angles will be as
precise as the
John,
SOLUTION C: What if I built the gnomon first and use its shadow to tell me
the position of the time lines With this method, no calculations,
plotting, protractors or tape measures are needed. Using a shadow
sharpener, the exact position of each timeline could be marked onto the dial
