Basic Scribing Techniques
A finish carpenter shares his secrets for fitting trim to uneven, unlevel or unplumb surfaces
Scribing is the art of joining building materials snugly to irregular surfaces. This article, written by a finish carpenter, lists a number of tips and techniques for getting trim, wainscoting, and flooring to fit perfectly, even when adjoining surfaces don't.
From Fine Homebuilding77
, pp. 58-63