The Six and thirtieth Figure,
Preparatory to the Thirty-seventh.
In the Geometrical Plan C, and in the Elevation thereof AB, I have only mark’d the principal Lines, as well for avoiding Confusion in the Figure, as that something might be left to the Industry of the Studious. The Line of the Plan EG has the Divisions of Breadth P, and of Length Q, of the Geometrical Plan C. From the Points of Breadth are drawn, as usual, Visuals to the Point of Sight O; From the Points of Length occult Lines are produc’d to the Point of Distance, which lies fourteen Modules without the Line AB: And where the occult Lines from the Divisions of Length cut the Visual FO, Parallels are made to the Ground-Line EF; and from the Intersections of those Parallels with the Visuals, you complete the Delineation of the Plan in Perspective.
The Lines which in the Plan are parallel to EF, being prolong’d to the Visual EO, are then continu’d parallel to the Perpendicular DE. And from the Divisions of AB, produc’d to DE, visual Lines are drawn to the Point of Sight; which intersecting the Perpendiculars aforesaid, you from thence find the Length of the Elevation in Perspective.
Fig. xxxvii.
FIGURA Trigesimaseptima.
Deformatio columnæ Etruscæ.