The use of coagulants in the application of enamels to plastic clay bodies
A 1915 ceramic engineering thesis by Charles Francis Geiger at the University of Illinois, testing how coagulants affect enamel slips applied to plastic clay bodies, written for faculty examiners and trade chemists. Its plates are hand-drawn curves in red and black ink on printed green graph paper, with lettered captions and numbered axes—useful for grid textures, plotted line forms, and hand-labelled scientific charts.
