Aeronautic Power Plant Investigations
A 1918 technical report from the NASA Technical Reports Server, a record of aeronautic power plant investigations, with no named author or place of origin given in the catalogue. The three pictures are engineering line drawings: an isometric box-like housing with a rectangular port, a sectional plan of a chamber with a cylindrical fitting, and a dimensioned diagram of international screw thread forms in rounded and flat root profiles. A designer could take from them the clean, hatched, labelled style of early technical diagrams, with cross-hatching for section cuts and numbered callouts.
