PIPE, in building and other employments or arts, a canal, or conduit, for the conveyance of water and other liquids. Pipes for water, water-engines, and the like, are usually made of lead, iron, earth, or wood; the latter being usually made of oak or elder. Those of iron are cast in forges, and their usual length is about two feet and a half; several of these being commonly fastened together by means of four screws at each end, with leather or old hat between them to stop the water. Those of earth are made by the potters, and are fitted into one another, one end being always made wider than the other. To join them the closer, and prevent their breaking, they are covered with tow and pitch; their length being usually about that of the iron pipes. The wooden pipes are trees bored with large iron augers, of different sizes, beginning with a less, and then proceeding with a larger successively; the first being pointed, the rest being formed like spoons, increasing in diameter from one to six inches and more. See BORING.