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

FIGURA SEXTA.

John James translation

Modus opticæ delineationis, absque lineis occultis.

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

In hac figura sexta, vestigium geometricum B seorsim posui ab elevatione geometrica A, ut deinceps faciemus. Vestigium B opticè contractum in E est NMRS; elevatio contracta longitudinis vestigii est FTSN. Posito autem quòd altitudines FN, 1, 5, 2, 6, sint æquales; latitudines NM, 1, 2, 5, 6, sint æquales; & rectæ NM, 5,6, sint in linea X plani; rectæ FN, 1, 5, sint in perpendiculo V: anguli 3 & 4 basis C habent eandem elevationem seu distantiam à linea X plani, quam habet angulus T: anguli 1 & 2 habent elevationem, quam angulus F: anguli 3 & 7 habent eandem latitudinem seu distantiam à perpendiculo V, quam habet angulus R: anguli 2 & 6 habent eandem latitudinem, quam habet angulus M.