Leitfaden des Röntgen-Verfahrens
A German technical handbook on X-ray apparatus and technique, written by Friedrich Dessauer with Bernard von Wiesner and Guido Holzknecht and published in Berlin in 1903 for physicians and radiographers learning the new equipment. The plates are plain black line diagrams of electrical current over time — sawtooth, sine and clipped pulse curves with italic letter labels on cream paper — usable as ready-made waveform motifs, axis-and-curve schematics, or period scientific lettering.
