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Hi Dan,
This is a fairly typical diptych dial, probably 17th century. Museums such as 
the Whipple in Cambridge have large collections. It would probably be possible 
to date yours more accurately by careful comparisons.
The string gnomon for the horizontal dial is fixed to the wrong point - it 
should come from the intersection of the hour lines on the horizontal dial.
The two scaphe dials normally show Italian and Babylonian hours.
The windrose on the outer surface is for showing wind direction. The small hole 
in the panel allows the compass needle to be observed when the dial is closed. 
The counter-changed rule is not original, I believe, and is an inappropriate 
replacement. There should be a small vertical windvane which would fit in the 
centre of the rose.
I hope this helps.
John------------------- Dr J Davis
Flowton Dials http://www.flowton-dials.co.uk/
BSS Editor http://sundialsoc.org.uk/publications/the-bss-bulletin/

      From: Dan-George Uza <cerculdest...@gmail.com>
 To: Sundial List <sundial@uni-koeln.de> 
 Sent: Friday, 10 August 2018, 9:23
 Subject: Dyptich sundial - help!
Dear all,
I've recently found this piece in a museum near me and I need your help in 
dating it. 
Why are the hour marks offset? I suspect a correction for latitude. And what do 
the two small circular dials on the bottom measure?
Also what would be the purpose of the circular shape containing the alidade? I 
suspect it has something to do with the winds. 
Any info will be highly appreciated.
Thank you,
Dan Uza



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