From: mb@nospam.net   
      
   NLS   
      
   OS Six-Inch Ireland 1st edition maps (1820s-1840s)   
      
   We have added online 1,970 maps forming the Ordnance Survey of Ireland's   
   Six-Inch 1st edition series (surveyed 1829-1842). This is the earliest   
   comprehensive mapping of Ireland, showing good landscape detail.   
   Ordnance Survey began work in Ireland in 1824, working initially on   
   creating an accurate triangulation network. The surveying and   
   publication of map sheets generally proceeded from north to south.   
   Ordnance Survey mapped Ireland at the Six-Inch scale before Scotland,   
   England and Wales, and the maps show emerging practices for this series   
   in terms of features, placenames, heights, and engraving techniques.   
      
   https://maps.nls.uk/additions/   
      
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