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skibbal, skibbet

In County Clare, Ireland, ? – 19ᵗʰ century, = 2 bushels or 7 stones of oats.

Edward Wakefield.
An Account of Ireland, statistical and political. vol. 2.
London: Printed for Longman, Hurst, Rees, Orme, and Brown, 1812.

Page 202. Wakefield appears to indicate that the information is taken from Hely Dutton, below.

sources

In some places they have a measure called a skibbet; it contains two bushels or seven stone of oats.

Hely Dutton.
Statistical Survey of the County of Clare, with observations on the means of improvement etc..
Dublin: 1808.
Page 356.