Recent European Developments in Helicopters
A 1921 technical report on European helicopter development, issued by NASA's Technical Reports Server and drawn from its archive of early aeronautical records. The single picture is a rotated, faded photograph of a small aircraft-like object against a pale sky, with a dark band of landscape or silhouette along the right edge. A designer might take from it the sparse, high-contrast look of early aviation photography, with a lone craft set in a large empty field of light.
