Dumbarton acre

In Scotland, a unit of land area, = 6084 4/9 square yards. Also called the Banff acre and Renfrewshire acre.

John Chalmers Morton.
A cyclopedia of agriculture, practical and scientific: in which the theory, the art, and the business of farming are thoroughly and practically treated. Vol.2
Glasgow: Blackie and Son, 1855.
Page 938.