This article describes the use of a photoresist lacquer (Kodak Photoresist, KPR) and a photographic negative with grid patterns as fine as 2,000 lines per inch (from firms specializing in photographic scale reduction for resist etching and electro-plating) on the end grain of dry wood to obtain information on strain associated with the penetration of a cutting edge into wood. References from 1967-68. -- CCI