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o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o +


Me too, I will be interested in receiving an image. You may sent at my address 
also a big one (up to 10 MB).
vladimiro

vladi...@iuav.it



Il giorno 27/dic/2011, alle ore 10.41, Joaquim Alves Gaspar ha scritto:

> This is a MapHist list message.
> News: If you don't get messages anymore, go to http://www.maphist.nl for news 
> about the new MapHist Forum
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> 
> 
> Hi Bill & all,
>  
> We have 32 points in a wind rose but you only refer to 9 in each direction. 
> It would also be nice to have an image even a small one (does the system 
> allow it to be attached?).
>  
> Joaquim
>  
> De: maphist-boun...@geo.uu.nl [mailto:maphist-boun...@geo.uu.nl] Em nome de 
> Bill Thoen
> Enviada: terça-feira, 27 de Dezembro de 2011 02:32
> Para: maphist@geo.uu.nl
> Assunto: [MapHist] Odd Numbers on an Old Wind Rose
>  
> I recently was asked a question about a compass or wind rose that had some 
> odd numbers marking the 32 points. Instead of degrees or points it's marked 
> 17 1/2 over the fleur de lis at north and then in both directions, every 
> 11.25 degrees the markings go
> 18
> 19
> 21
> 25
> 31 1/2
> 46
> 88
> 0 at due west and due east.
> The actual angles are 11.25 degrees per division, but if you plot these 
> numbers against the actual angles you get a very smooth curve that looks 
> exponential or maybe logarithmic. This graphic was seen in the Ch. Columbus 
> museum on Porto Santo, a small island of Madeira, Portugal.
> 
> 
> The question is, what do these numbers mean? I've got a couple of images, but 
> they're too big to show you here. I thought I'd just ask if anyone knows 
> anything about this sort of numbering before I go to further lengths. For all 
> I know this could be an easy one. I just can't figure out if this is some 
> sort trigonometry calculator or what it was supposed to do for the mariner of 
> Columbus' time. (I don't have a date for it either; I'm assuming it's 15th 
> century.)
> 
> So is this a common numbering scheme or do you need to see the pictures?
> 
> Regards,
> 
> Bill Thoen
> GISnet
> http://gisnet.com
> 303-786-9961
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