A deflection formula for single-span beams of constant section subjected to combined axial and transverse loads
This is a 1935 NACA technical note from the National Advisory Committee for Aeronautics, issued as a mathematical engineering report for structural analysts working on aircraft spars and beams. Its pictures are line plots of dimensionless deflection coefficients against a ratio along the span, drawn as families of labelled curves on squared grid paper, offering a designer a clear model of how a set of related curves can be read as a graphic system of arcs and gridlines.
