Fer, congratulations with the Sawyer Dialing Prize ! On the Roman Surveyor's problem, I can add to Fer's article the summary that I made of it. I have added the pictures of Fer's article to the summary.
It is on http://www.rhayward.demon.nl/sundial/sum99-4/sum99-4.htm#Roman Some days ago, I have also added (much too late, admittedly) summaries of the Bulletins 00.1 and 00.2 All can be found on http://www.rhayward.demon.nl/ Rudolf ----- Original Message ----- From: fer j. de vries <[EMAIL PROTECTED]> To: Allan Pratt <[EMAIL PROTECTED]>; Sundial Mailing List <[email protected]> Sent: Friday, September 08, 2000 10:39 AM Subject: Re: Meridian Line Question Hi Allan, Yes there is. The old Roman surveyors used 3 shadowpoints of a vertical (pin) gnomon to find the east-west line, thus also the nort-south line is known. It is even possible to construct a sundial on any flat plane with only the knowledge of these 3 shadowpoints. It isn't necessay to know the latitude or the orientation of the plane. I wrote an article (in Dutch ) about this method in the bulletin of De Zonnewijzerkring, nr. 4, 1999. This article is based on a publication in French on the Internet by Yvon Massé. http://www.union-fin.fr/usr/ymasse Title: Comment tracer un cadran solaire incliné et declinant a l'aide de trois observations d'ombres inégales. Best wishes, Fer.
