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

For the more quick Dispatch of this, I commonly fold the Paper, as you see in A.

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.

THIRD FIGURE.

An Oblong Square in Perspective.

What was done in the preceding, repeat in this Third Figure. Transfer the Breadth BC into BC, and the Length into CD, drawing the Breadth BC to the Point of Sight O, and the Length CD to the Point of Distance E. Where this cuts the Visual CO, you terminate the Square FG, BC, by drawing the Parallel, as before.

FIGURA QUARTA.

Quadratum duplex opticé.

Eodem modo construes quadratum duplex A, transferens circino, aut duplicando chartulam, latitudinem cujuscumque lineæ, ut vides in punctis 1, 2, 3, 4, 5, 6, super lineam plani in iisdem numeris, & ab istis transferes visuales ad punctum O. Postea transfer longitudinem 7, 8, 9, 10, super lineam plani in iisdem pariter numeris, & ab istis duc lineas ad punctum distantiæ E. Ubi hæ lineæ secant lineam 6, 7, O, fiunt lineæ parallelæ ad lineam plani, & quadratum conficitur; parem constructionem facies de quadrato secundo, & tertio, facilè ex dictis.