Descrizione e disegno dell'emissario del Lago Albano
A 1762 Roman survey of the ancient drainage tunnel of Lake Albano, written and engraved by Giovanni Battista Piranesi for scholars and antiquarians interested in Roman engineering. Its plates mix perspective views of the dim tunnel interior and the outside slope with plan and section drawings, showing how cut stone, arches and channels fit together in the ground. A designer might take the layered cross-sections, the contrast of deep shadow against fine hatching, and the labelled plan sheets as models for technical diagram layouts.
