Volumen quartum.
A volume of architectural plates in the Piranesi-era engraving tradition, from a collection held by the Werner Oechslin library in Einsiedeln, showing classical building sections, plans and elevations. Its pictures are measured line engravings in sepia and grey with columns, colonnades, arches and ground plans set out with lettered reference marks, useful to a designer studying classical proportion, rhythm of columns and the logic of Roman interior layouts.
