Ad quadratum
Subtitle: a study of the geometrical bases of classic & medieval religious architecture, with special reference to their application in the restoration of the cathedral of Nidaros (Throndhjem) Norway
By: by Fredrik Macody Lund; profusely illustrated by plans, sections, views and details of notable temples, churches, cathedrals & other buildings in Greece, Italy, Germany, Denmark, France, England & Norway.
Publisher: B.T. Batsford
Published: 1921
Place of publication: London
Language: eng
Number of pages: 385
Subjects: Trondhjem. -- Cathedral.; Church architecture -- Europe.; Cathedrals -- Europe.; Architecture -- Composition, proportion, etc.
Notes: "Printed by order of the Norwegian Parliament."

"Rules of religious architecture were a secret science in the middle ages, just as they were in classic times ... Through this secrecy, the rules became forgotten ... It is this forgotten science which we have discovered, and which we develop in this work."--P. xxii.