Annals of the Astrophysical Observatory of the Smithsonian Institution
This is a government-published scientific annual, the Annals of the Astrophysical Observatory of the Smithsonian Institution, printed in Washington in 1900 for researchers studying solar radiation and infrared spectra. Its pictures are plain line graphs and tracings: dense wavy traces across ruled grids, with spectral curves and time-series charts that a designer could borrow for data-driven patterns, rhythmic line textures, or technical diagram layouts.
