Measures to ecure a patent for the above have been taka by Ernest Marx, of New York City. Ths invention consists in making tubes by rolling up sheets of iron or other ductile mtfal in successive convolutions until the requird diameter and thickness are formed, and thesecuring it in such form by any suitable mems. Tubing thus made may be used for maihine-shafting or connecting rods, lor masts (f vessels, and for almost all purposes where ubes or bar-iron are employed. The advantge proposed is its capability of offering greatlresistance to tension, torsion, or flexure, beingstronger in proportion to its weight than ban or tubes made in any other way, for the reason that any flaw or defect in the metal cannol extend far.