“Fig. 81. Relief Der Funktion …,” from the notorious “Funkt
“Fig. 81. Relief Der Funktion …,” from the notorious “Funktiontafeln mit Formuln und Kurven” by Jahnke and Emde. Published for the first time in 1906 these two Germans didn’t have any computers to do their calculations, so they graphed abhorrent functions like this one by hand and head. Back in the day their books were very widely used, today they’re remembered mostly for their unparalleled accuracy. -- source link
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