Zerlegbares Modell des Otto'schen Gasmotor
A German technical catalogue of a dismantlable model of the Otto gas engine, made by Christoph Volkert in 1910 and held by the Eisenbibliothek. Its colour lithographs show the engine in cutaway side elevation, with flywheels, cylinders and valve gear drawn in flat grey-green and cream tones with fine black linework, and one red-printed title panel for a different subject. A designer might take the flat, measured engineering-drawing style, the pale green-grey palette with cream ground, and the sectional, exploded-view layout.
