It is used during daylight hours. The balloon is filled to such degree that its ascent rate is known. By measuring the time period between the start of the balloon and the moment it hides in the cloud can be determined the height of the cloud base.
imbrication lines (imâ³bro brÃ´Â´ika shÉn) , lÄ«nz.n pl. 1 the seams which are formed by overlapping layers of tissue in order to close a surgical. wound. 2 slight mesiodistal ridges in the cervical third of a. tooth
Perpendicular Lines and Intersecting Lines. In case of a two dimensional plane, two intersecting lines are said to be perpendicular lines if they intersect at right angles. In three dimensional space, if two lines are perpendicular, the dot product of their direction rations is zero. It is to be noted that the perpendicular lines need not intersect.