Wm. S. Maddux wrote: > > Re the hour limitation line/curve for a Capuchin dial, > John Hoy wrote: > > > Is that line an arc of a circle? > > Fer de Vries wrote: > > >The line through the endpoints of the date arcs > >isn't an arc of a circle. > >I calculate or construct a number of endpoints and > >connect them to a smooth line.
> I believe that the curve segment in question is a > portion of an hyperbola. > > W. Maddux Hello Bill, I had in mind this curve is a part of an hyperbola but I was not for sure. Now I looked up in the special bulletin about the Eisinga carddial and indeed there is stated this curve is a part of an hyperbola. I myself never proofed it. Thank fot noting it. Best wishes, Fer. -- Fer J. de Vries [EMAIL PROTECTED] http://www.iaehv.nl/users/ferdv/ lat. 51:30 N long. 5:30 E
