NASA_NTRS_Archive_19930091240
A 1924 technical report compiled by the NASA Technical Reports Server, its only picture a black-and-white halftone photograph of a compact dark metal instrument with a large round front plate, a knurled knob and a bracketed carrying handle on top. Designers could take from it the plain, documentary look of early twentieth-century engineering photography, with its clean dark masses and sharp studio lighting.
