in general, denotes the representation of something drawn on a plane; such are maps, charts, ichnographies, &c. See MAP, CHART, &c.

The term plan, however, is particularly used for a draught of a building, such as it appears, or is intended to appear, on the ground, showing the extent, division, and distribution of its area or ground-plot into apart- ments, rooms, passages, &c.

A geometrical plan is that wherein the solid and vacant parts are represented in their natural propor- tions.

The raised plan of a building is the same with what is otherwise called an elevation or orthography. See OR- THOGRAPHY.

A perspective plan is that exhibited by degradations or diminutions, according to the rules of perspective. See PERSPECTIVE.

To render plans intelligible, it is usual to distinguish the masses with a black wash; the projections on the ground are drawn in full lines, and those supposed over them in dotted lines. The augmentations or alterations to be made are distinguished by a colour different from what is already built; and the tints of each plan made lighter as the stories are raised.

In large buildings it is usual to have three several plans for the three first stories.