Data on the Design of Plywood for Aircraft
This is a 1921 technical report issued by a government aeronautics body for engineers and aircraft designers, covering test methods for plywood intended for aircraft construction. Its pictures are plain black-and-white photographs and a line drawing of test rigs: a column bending machine loading a curved plywood strip, hands measuring cupping and twisting on wood panels, a man operating a fiber-testing machine, and a press-screw diagram for gluing a joint. A designer could take from them the clean, documentary look of early engineering photography and simple technical line drawing.
