In Finland, 20ᵗʰ century, a unit of length for measuring lumber, = 1 inch = 2.54 centimeters.¹ Also called a tum.
Earlier, the tuuma was 2.474 centimeters.
1. United Nations, 1966.
Copyright © 2000 Sizes, Inc. All rights reserved.
Last revised: 26 September 2005.