Photographic time studies of airplane paths
A 1926 technical report from the NASA Technical Reports Server on photographic time studies of airplane flight paths, a record of aeronautical measurement rather than a book for a general readership. The single picture is a plain line diagram of a tapering triangular wedge with a dash-dot centreline, a dimension bar labelled L along the top, and lettered points B and D, showing geometric construction for measuring a flight path. A designer might take its spare, precise linework and lettered annotation as a model for technical schematic styling.
