Ueber theater, oder, Bemerkungen über Katakustik in beziehung auf Theater
An 1810 treatise on theatre acoustics printed in Berlin by Carl Ferdinand Langhans, an architect writing for builders and theatre designers. Its plates are dense geometric drawings of sound paths, seating curves and reflecting surfaces, set out in fine black line on cream paper. A designer could take from them the look of precise radiating line networks and arcs that map how sound travels across a curved auditorium.
