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
HomeÂ»Basement WaterproofingÂ»French Drain. Despite the name, French drains are the product of American ingenuity. The first examples were developed by Henry Flagg French, a lawyer and farmer who lived in Concord, Massachusetts in the mid-1800s.