Hi Chris, Thanks for the picture of your universal polar dial for civil time. You name this one a kind of a bifilar dial which may be correct if you assume the line where you read the time to be one of the fillars.
However, I would call this dial an equant dial as developed by Fred Sawyer about 20 years ago. With that idea many kinds of dials can be constructed and not only the polar dial. The recent discussion however is more or less limited to the polar dial with parallel hourlines but thanks for your contribution. Best wishes, Fer. Fer J. de Vries mailto:[EMAIL PROTECTED] http://www.iae.nl/users/ferdv/ Eindhoven, Netherlands lat. 51:30 N long. 5:30 E ----- Original Message ----- From: "Chris Lusby Taylor" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, January 09, 2003 11:51 AM Subject: Re: Quest for a civil time polar sundial, continued... > A mean time polar sundial without curved hour lines is possible, if the user > is permitted to adjust it for the EoT. It can show Summer Time / Daylight > Saving Time, too. > > The dial I propose is entirely fixed except for a circular dial plate that > rotates about its centre. This is much easier to make than a polar mount. > Like all polar dials, it is universal. > > I have taken the liberty of attaching a small (13KB) GIF file that shows the > dial. It is a form of bifilar dial, though you would hardly guess that to > look at it. > > Chris Lusby Taylor > Newbury, Berks., England > 51.4N, 1.3W > > > -
