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Irish measure

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History

The size of the mile and acre are derived from the length of the surveyor's rod, a unit which in Ireland was called a perch (or linear perch to distinguish it from the square perch). A mile is 320 linear perches and an acre is 160 square perches. The length of the perch was not standardised nationwide at the time of the Tudor conquest of Ireland; the city walls of Cork used a 29-foot perch. The 21-foot perch which became standard in Ireland during the Plantations was found elsewhere; in 1820 it was reportedly used for linear measure in Guernsey, and for measuring fencing in Herefordshire and "labourer's work" in South Wales.

English measure was sometimes used in the Kingdom of Ireland. The Plantation of Munster of the 1580s used the English acre. In 1642 the Adventurers' Act, to compensate those who funded the army that put down the 1641 rebellion with land confiscated from rebels, specified amounts in "English measure", but was quickly amended to "Plantation measure". The "mile line" of the 1652 Cromwellian settlement, prohibiting Catholics settling within a mile of the Connacht coast or River Shannon, was an English statute mile. A 1653 survey of lands of the Countess of Ormonde in County Kilkenny used statute acres, whereas the 1654–5 Civil Survey and 1655–6 Down Survey used plantation acres. Irish acres were used in the 1823–37 applotments made under the Composition for Tithes (Ireland) Act 1823. A third system, "Scotch measure" or "Cunningham measure", was also used in Ulster Scots areas.

Many 18th-century statutes of the Parliament of Ireland specified distances without specifying Irish or English measure, which led to confusion and disputes. From 1774 until the 1820s, the grand juries of 25 Irish counties commissioned maps at scales of one or two inches per Irish mile but the County Mayo maps (1809–1830) were surveyed and drawn by William Bald in English miles and just rescaled to Irish miles for printing. The Ordnance Survey of Ireland, from its establishment in 1824, used English miles. Thomas Telford's Howth–Dublin Post Office extension of the London–Holyhead turnpike had its mileposts in English miles. Irish measure was formally abolished by the 1824 Weights and Measures Act but the Irish Post Office continued to use the measure until 1856. An 1800 act fixed the maximum penalty for burning land at 10 pounds per "Irish plantation acre"; in 1846 a fine of 70 pounds was overturned in Queen's Bench as exceeding this limit: although the evidence related to seven Irish acres, the form of conviction "seven acres" must legally have referred to statute acres. In two 1847 parliamentary returns of distances between Irish towns, values were in Irish miles for some counties and statute miles for others. In 1878 the High Court of Justice in Ireland ruled that, unless "Irish acres" is explicitly specified, the word "acres" in a will must be interpreted as statute acres, notwithstanding external evidence that the opposite was intended.

Several post-1824 statutes used Irish measure when repeating the text of a pre-1824 statute being replaced or amended. The Lighting of Towns (Ireland) Act, 1828 allowed those residing within one Irish mile of a town market to vote on whether to establish town commissioners. The Parliamentary Boundaries (Ireland) Act 1832 defined the radius of Sligo borough as "One Mile, Irish Admeasurement, from ... the Market Cross"; the same as the boundary established for local taxation purposes in 1803. The Fever Hospitals (Ireland) Act 1834 allowed certain tenants to demise up to "six roods, plantation measure" to a fever hospital. The Grand Jury (Ireland) Act 1836 allowed grand juries to allocate up to "two plantation acres" for a Church of Ireland diocesan school. The Church of Ireland Act 1851 allowed a chapel of ease to be built on certain types of plot of up to "One Acre Plantation Measure".

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