Ah!
Thanks for clearing up the the type of dial in the Jaipur photo. The photo is too small to read the tiny numerals and there is no surrounding scenery to judge it by. I thought it was a horizontal face with a vertical gnomon. But it's an equatorial. Thanks again, John -----Original Message----- From: Peter Mayer [mailto:[email protected]] Sent: Sunday, June 28, 2009 4:53 AM To: John Carmichael Cc: 'Sundial List' Subject: RE: Is this a sundial? Hi John, I've just looked in my copy of _The Astronomical Observatories of Jai Singh_ (New Delhi: Archaeological Survey of India, 1982). The dial in question is the Nari Valaya Yantr ("Circular Dial"). Here's a composite description (most material taken from the Delhi observatory): "It may be described as a cylindrical dial--the axis of the cylinder pointing north and south, and the northern and southern faces being parallel to the plane of the equator. At the centre of each face, and at right angles to it, is an iron style surrounded by circles graduated into hours and minutes... There are similar instruments, but much smaller at Ujjain and Benares. The instrument at Jaipur is a masonry cylinder some 10 feet in diameter." pp.39 & 53 BTW, Jai Singh's approach is the best solution I've seen to 'problem' of reading an equatorial dial in both halves of the year. In essence, the two faces are separated by several meters, yielding the horizontal cylinder of the description. Depending on the time of year one goes to one end or other of the cylinder to read the dial. cheers, Peter Quoting John Carmichael <[email protected]>: > > > > > Here's another one like it in Japur, but this seems to be properly marked > with solar azimuth degrees: > > > > <http://www.flickr.com/photos/sourendu_gupta/2255557178/> > http://www.flickr.com/photos/sourendu_gupta/2255557178/ > > > > > > > > From: [email protected] [mailto:[email protected]] On > Behalf Of [email protected] > Sent: Saturday, June 27, 2009 1:20 PM > To: [email protected] > Subject: Re: Is this a sundial? > > > > As you say, it does not look like a proper dial at all. I suppose there > might be a nodus (which we cannot see in the photo) that would enable it to > show time on two dates in the year but it doesn't look like it. > > > > It looks like yet another non-dial. Sadly there are quite a few around! > > > > Patrick > > -----Original Message----- > From: John Carmichael <[email protected]> > To: 'Sundial List' <[email protected]> > Sent: Sat, Jun 27, 2009 7:16 pm > Subject: Is this a sundial? > > > > Is this a sundial? See: > <http://www.flickr.com/photos/hiddensarah/487384689/?addedcomment=1#comment7 > 2157620640577688> > http://www.flickr.com/photos/hiddensarah/487384689/?addedcomment=1#comment72 > 157620640577688 > > > > If it is, it appears that it only tells the solar azimuth and not the time. > > > > > > > --------------------------------------------------- > <https://lists.uni-koeln.de/mailman/listinfo/sundial> > https://lists.uni-koeln.de/mailman/listinfo/sundial > > _____ > > > Don't let your email address define you - Define yourself at > <http://tunome.com/?ncid=aolaff00030000000003> tunome.com today! > > -------------------------- Peter Mayer Politics Department The University of Adelaide, AUSTRALIA 5005 Ph : +61 8 8303 5606 Fax : +61 8 8303 3443 e-mail: [email protected] CRICOS Provider Number 00123M ----------------------------------------------------------- This email message is intended only for the addressee(s) and contains information that may be confidential and/or copyright. If you are not the intended recipient please notify the sender by reply email and immediately delete this email. Use, disclosure or reproduction of this email by anyone other than the intended recipient(s) is strictly prohibited. No representation is made that this email or any attachments are free of viruses. Virus scanning is recommended and is the responsibility of the recipient. --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
