Plane

In aeronautics, the term commonly applied to a supporting surface of an aeroplane: Plane of Comparison.— A plan of a' fortre , and of the surrounding country, on which are expre ed … ttataxurce … the principal points from n horizontal plane … through tbe highest or lowest 453 points of … Vfcfe woxn … Plane of Defilade. — A plane supposed to pa through the summit or crest of a work, and parallel to the plane of site.