Reflection Sundials

[Claude Hartman]

I am searching for references to REFLECTION SUNDIALS that do more than 
just project a spot on the wall or ceiling.
Daniel Roth has given me one example: The Gallery of the Astrolabe in 
Rome.
I have copies of many related U.S. patents up through 1993.  I have not
searched any foreign patents.
If anyone knows of others I might contact who might help I would greatly 
appreciate it.