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
French Drain. A French drain is used to gather water. Categorized by the use of crushed gravel, French drains are placed in the places where water needs to be collected from, such as a swampy section of a yard or along the baseboard of a basement. In a yard, a French train can be created by digging a 6-inch-deep by 12-inch trench.