Longitude error in Aust-Hung Map 1910 of Central Europe

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On 3 Aug 2005, as part of a question "what is nee in Polish" Steven Tesser
wrote

>A second question: the 3rd Military Mapping Survey of Austria-Hungary, at
> http://lazarus.elte.hu/hun/digkonyv/topo/3felmeres.htm
>the (East-West) longitudes seem to be off by about 17 degrees, 45
>minutes. That is, the longitudes shown at the top of the map are
>consistently 17 degrees, 45 minutes too high.

>That would make sense if they started with the zero longitude running
>(North-South) through the western end of cornwall, or something. Has
>anyone noticed theis problem with the map?

Yes I noticed this on the map and in checking it out with a world map the
longitude numbers are off as he says but the zero North-South line for 17
degrees difference from Greenwich would go through Iceland and the West
Canary Islands, not Cornwall. I also noticed a small note at the bottom of
the map and just above the long Remarks chart which says "Longitude is
counted from Ferro".
I have no idea where "Ferro" is. Although this could possibly mean Magnetic
North as in Ferrous for iron. This would be that far West from Central
Europe.

Abe Simon
Las Vegas NV
email abe_simon@xxxxxxx
---
Sender: Abraham R Simon <abe_simon@xxxxxxx>
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