Perch (unit) - Volume

Volume

A traditional unit of volume for stone and other masonry. A perch of masonry is the volume of a stone wall one perch (16+1⁄2 feet or 5.03 metres) long, 18 inches (45.7 cm) high, and 12 inches (30.5 cm) thick. This is equivalent to exactly 24+3⁄4 cubic feet (0.916667 cubic yards; 0.700842 cubic metres).

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