The Strength of One-Piece Solid, Build-Up and Laminated Wood Airplane Wing Beams
This 1920 technical report on wood airplane wing beams was issued by the NASA Technical Reports Server, though its original authorship and publishing context are only partly recorded in the catalogue. The pictures are engineering cross-section diagrams of I-shaped beams with dimensioned drawings, plus a photographed row of laminated wood beam sections from the Bureau of Standards, showing grain layering and stacked wood construction a designer might find useful for structural line work and technical plates.
