The Velox book : the working of a simple paper told in simple terms
A 1915 photography manual published in Tacoma, Washington by the French Drug Company, explaining how to make prints on Velox paper from negatives of differing density. Its pages show paired figures of a girl with a cup at a wooden table, comparing prints from weak and strong negatives, so a designer can draw on its clear diagrammatic photographic demonstrations of tonal contrast in black and white.
