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

by Andrea Pozzo

FIGURA TERTIA.

Rectangulus altera parte oblongior opticé.

Quidquid in proximo quadrato vidisti, facies in præsenti. Transferres latitudinem BC in BC, & longitudinem in CD, ducens latitudinem BC ad punctum oculi O, & longitudinem CD ad punctum distantiæ E. Ubi vero hæc linea secat visualem CO, erit terminus rectanguli supradicti FG, BC, ducens parallelam, ut supra.