ALTITUDE, accessible and inaccessible. See GROMETRY.
The method of taking considerable terrestrial altitudes, of which those of mountains are the greatest, by means of the barometer, is very easy and expeditious.
Is done by observing, on the top of the mountain, how much the mercury has fallen below what it was at the foot of the mountain. See BAROMETER.
ALTITUDE of the Eye, in Perspective, is a right line let fall from the eye, perpendicular to the geometrical plane.