NASA_NTRS_Archive_19930091062
A 1920 technical report, held by the NASA Technical Reports Server, that sets out calibration curves for a Larson tensiometer, a hand instrument for measuring wire tension, with no named author. The pictures are mostly plain graph sheets of dial reading against total load in pounds, drawn in fine ink on squared paper, with one photograph of the instrument held in a hand, set against a grey backdrop; a designer might take from them the spare grid-and-curve layout and the clean hand-drawn chart style.
