by mail1.rrz.Uni-Koeln.DE (8.9.3/8.9.3) with ESMTP id TAA06283 for <[email protected]>; Sun, 22 Oct 2000 19:48:24 +0200 (MET DST) Received: from multi1.utaiop.at ([10.1.1.195]) by smtp1.utaiop.at (Netscape Messaging Server 4.15) with ESMTP id G2UESN02.WAO for <[email protected]>; Sun, 22 Oct 2000 19:48:23 +0200 Received: from son ([212.152.209.73]) by multi1.utaiop.at (Netscape Messaging Server 4.15) with SMTP id G2UESM03.TFS for <[email protected]>; Sun, 22 Oct 2000 19:48:22 +0200 Message-ID: <[EMAIL PROTECTED]> From: "Sonderegger Helmut" <[EMAIL PROTECTED]> To: <[email protected]> References: <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> Subject: Re: Bifilar Again! Date: Sun, 22 Oct 2000 19:43:09 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2919.6600 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600 Hallo to everybody, also Rafael Soler Gaya - a sundial expert in Spain - calls these types of sundials in his book bifilar. So it seems to be common in Spain too and I think it makes sense to call such dials described below BIFILAR. Helmut ----- Original Message ----- From: "fer j. de vries" <[EMAIL PROTECTED]> Subject: Re: Bifilar Again! Sender: [EMAIL PROTECTED] Precedence: bulk
> Hello Sarah, > > The 2 threads or edges may be straight or curved and may have any > orientation. > As long as there are 2 shadows of which the intersectionpoint is used as the > point where to read the dial I call the dial a bifilar dial. > This is based on historical reasons as I wrote in another message. > > The original idea by Micknik was a dial with equiangular hourlines. > New ideas with one curved thread and one straight thread give dials with > parallel datelines or with parallel hourlines. > Many other ideas are just for fun to show what happens with the patterns. > > Theoretical it is possible to use 2 curved threads or edges, however I never > saw such a dial. With 1 curved thread a number of examples may be found in > literature and even there is an example with 2 cylinders as shadowcasters. > > Best wishes, Fer. >
