A Study of Transparent Plastics for use on Aircraft, Special Report
A 1937 government technical report, issued by an aeronautics research body for engineers and aircraft designers, on how transparent plastics hold up for aircraft windows and canopies. The pictures are plain photographs of test specimens: exposure panels mounted on racks outdoors with calendar-printed backing, and a falling-ball impact rig with its clamping frame. A designer might borrow the stark, documentary look of weathering trials and industrial test equipment for materials or engineering themes.
