uragane　裏矩

KEY WORD :　architecture / tools

Also called urame 裏目. The scale marked on the back side of a carpenter's square, which is the square root of that marked on the front side omoteme 表目. The carpenter could calculate the curvature as well as determine sectional dimensions of a squared beam from an unhewn log.

REFERENCES:

*kanejaku 曲尺

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