What is MENISCUS? The departure from a flat surface where a liquid meets a solid, due to surface tension. The effect can be seen clearly through the wall of a glass tube. The surface of water in air rises up the wall of the tube, while that of mercury is depressed, SIGHT-FEED LUBRICATOR.
An abandoned mud-covered scooter is found during the draining of the Canal Saint-Martin in Paris, France Charles Platiau/Reuters
All you need to know about - French Drains - November 17th 2010. For many of us who aren't familiar with a French Drain, a French Drain is a simple and effective sloping trench dug in the ground, filled in with gravel or rock which will redirect rain water and ground water from one area to another.