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

FIGURA QUARTA.

John James translation

Optica descriptio quadrati duplicis.

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

Iam incipies frui compendio papyri complicatæ. Nam eam admovendo lineæ plani, nullo negotio notare poteris puncta 1, 2, 3, 4, 5, 6, linearum visualium, quæ ducentur ad O punctum perspectivæ. Exinde complicatâ rursum chartulâ in crucem ad P, notabuntur hæc puncta; 7, coincidens cum puncto 6, nisi quadratum distet à linea plani; 8, 9, 10. Ductis autem rectis ex 8, 9, 10, ad punctum E, ubi secant visualem 6, 7, O fient parallelæ, eritque completa delineatio.

In medio quadrati B, aliud quadratum facilè describetur, ducendo diagonales seu diametros ab angulo ad angulum, ut in figura.