Double Loxodrome (IMAGE) Princeton University, Engineering School Caption The double loxodrome technique is comprised of rows of vertical herringbone bricks that spiral around the dome and are filled in by horizontal field bricks. Effectively, each course of bricks creates a structural element known as a plate-bande or flat arch that wedges interior bricks between the vertical end caps to distribute load throughout the structure. Credit Vittorio Paris and Attilio Pizzigoni, University of Bergamo; Sigrid Adriaenssens, Princeton University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.