Dear Frans,
thanks again for your answer and the link provided. In the meantime I had
time to look up the link and the information behind it. By the way, the
link did also lead me to some phantastic informations.
Well, I must admitt that I do not understand the theory behind the Trifilar
Sundial
Hello Frans
Your link to all the articles of Fer’s Legacy is wonderful. Thank you very much
for telling us about it. I had already seen a copy of his article "Construction
of hemispherium", showing how to generate Babylonian and Italian hour lines in
a hemisphere bowl. Do you know if he desc
Dear Frans
Thank you very much for your reply. I can only imagine the time and effort all
of you have put into making Fer’s legacy available in data form and in English.
It is terrific!
The diptych concave is, I think, not a simple mathematical problem. I have done
it by 3D drawing but i
