Rules and Examples of Perspective proper for Painters and Architects, etc.

Figura Nonages. octava.

John James translation

Quadrans Architecturæ horizontalis in fornice, cum luminibus & umbris.

Illustration from Rules and Examples of Perspective proper for Painters and Architects, etc. In English and Latin: Containing a most easie and expeditious method to delineate in perspective all designs relating to architecture

Habes in hac paginâ quadrantem totius Operis, modo consueto erutum ex præcedenti: nimirùm, cuspide circini ex angulis vestigii accipiuntur lineæ perpendiculares; ex angulis verò elevationis desumuntur lineæ parallelæ, ac lineæ visuales ad punctum oculi.