Contrary Flexure

Beam so laid that a part curves in one direction and a part in another. Thus a beam supported IMG:content-0965.png:[merged small][subsumed][subsumed][merged small][ocr errors][subsumed][subsumed] would be cut out from the surface by parallel planes. Thus all points on the 1,300 and 1,400 feet contour lines are respectively 1,300 and 1,400 feet above the sea level or above the a umed datum plane.