The benefit of an altitude dial is that it does need to be aligned with the polar axis. With that concept in mind then a latitude adjusted altitude dial is not feasible.
However, if one gives up that benefit, and takes an altitude dial and then tilting it towards the pole, or away from it, in other words now aligning it with true north or true south, then the altitude dial will work at the adjusted new latitude. I have had fun with doing this with the shepherd dial. Some interesting dial plates can be generated that one would assume could never possibly work when so adjusted. However, they do. Simon Simon Wheaton-Smith www.illustratingshadows.com Phoenix, Arizona, W112.1 N33.5 >________________________________ > From: Bill Gottesman <billgottes...@comcast.net> >To: Steve Lelievre <steve.lelievre.can...@gmail.com> >Cc: "sundial@uni-koeln.de" <sundial@uni-koeln.de> >Sent: Sunday, June 1, 2014 3:35 PM >Subject: Re: Request for information about a type of altitude dial > > > >Neat dial. I don't know what it is called, but I like it and it's clever >pinhole date aperture. I suspect the note about attachment point and latitude >is incorrect. I am not aware of any altitude dial that is adjustable for >latitude (and still be mathematically correct). If there are any, I do not >think this is one of them. -Bill > > > > > >On Sun, Jun 1, 2014 at 6:13 PM, Steve Lelievre ><steve.lelievre.can...@gmail.com> wrote: > >Hi folks, >> >>http://www.pinterest.com/pin/301178293801331061/ >> >>What type of dial is this; I realize it's a form of altitude dial, but is >>there a specific name for it? >> >>The accompanying note states that the dial can be adjusted for latitude by >>moving "the attachment point". I don't understand which part of the mechanism >>does that. Can anyone explain it for me? >> >>Lastly, I'm appreciate references for articles or webpages that discuss these >>dials - history and mathematics. >> >>Thanks, >>Steve >> >> >> >> >> >> >> >>--------------------------------------------------- >>https://lists.uni-koeln.de/mailman/listinfo/sundial >> >> > > >--------------------------------------------------- >https://lists.uni-koeln.de/mailman/listinfo/sundial > > > >
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