Annals of the Astrophysical Observatory of the Smithsonian Institution
Annals of the Astrophysical Observatory of the Smithsonian Institution, published in Washington by the Government Printing Office around 1900, is a technical record of solar radiation measurement and infrared spectra for astronomers and physicists. Its pictures are plain line graphs of solar constant values plotted by day across months, and on the rotated page, multi-line curves of measured radiation; a designer might borrow their dense grid structure, thin dark trend lines, and sparse labelling for an austere data-visualisation look.









