Colouring matters for dyeing textiles
A 1906 Philadelphia technical manual on dyes and dyeing, written by J. J. Hummel, A. R. Foster and Paul N. Hasluck for textile dyers and chemists. Its pictures are plain line engravings of apparatus: a hydraulic press, a stationary steaming chest, a dye-works fitting and a lifting machine, drawn in elevation and plan with lettered reference points. A designer might take from them the clean, labelled mechanical diagram style, with thin uniform contour lines and sparse hatching.
