Ordnance Survey
Background OSI was established in 1824, in parallel with the Ordnance Survey in Great Britain. Initially, it conducted a detailed survey of the island of Ireland on a scale of 6 inches to one mile. Between 1825 and 1846, surveyors led by officers of the Royal Engineers, along with men from the ranks of the Royal Sappers and Miners, crossed Ireland, creating unique records and […]