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 < [email protected]> 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 > >
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