Elevation/Range (E) Scopes
Figure 1. - E-scope of “Spoon Rest”- radar
The E-scope was used by early radars, like the Russian “Spoon Rest”- radar family. The E-scope gives the target range against the target elevation (vertical) angle. The targets height could detect by a movably nomogram usually. Lines of equal heights on the nomogram have the form of hyperbole.