Re: M - questions

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Posted by Murrisk on April 24, 2001 at 06:10:48:

In Reply to: Re: M - questions posted by M on April 23, 2001 at 23:46:12:

Thanks for the information M. I wasn't aware that the Irish maps were the first Ordnance Survey maps to be drawn up. The surveyors produced beautiful work and these maps were the basis for the first geological maps of Ireland. I am interested in comparing maps of different ages to determine the changes in the size of Saleen and Lough Lannagh, and the impact of the drainage schemes on some smaller lakes that disappeared in the late 1800's.

By the way, how old does a map have to be before it passes out of copyright ?

The map posted at (circa 1911 ?) shows a race course on the west side of the Galway road just past Saleen Lake. The race course does not appear on a 1" = 1 mile Ordnance Survey/geological map from 1870. Neither does it appear on a 6" = 1 mile Ordnance Survey map, surveyed in 1893-99 and revised in 1913-17. The posted 1" = 1 mile map was almost certainly produced from the 1893-99 survey data. This would indicate the race course was built sometime after 1870 and did not survive past 1913-17. There are photographs of the Castlebar race course dating from around 1900 which agrees well with the dates for the Ordnance Survey (1893-99).

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