Principles of dyeing
A 1916 technical textbook on dyeing by George Stronach Fraps, published in New York and London by Macmillan, written for students and practitioners of the textile and chemical trades. The pictures are plain line diagrams of machinery and apparatus: a circular arrangement of radiating vanes around a central hub, a rectangular vessel with a dashed level line and a float, a tall multi-wheeled vertical frame, and a roller-and-cylinder arrangement with labelled sheets. A designer could take from them the schematic, lettered-diagram style of early twentieth-century technical drawing.
