A large and strong rope or chain, such as is attached to a vessel’s anchors, or the traction rope of a street railway ‘operated by the cable system, (Hooper v. Railway Co., 85 Md. 509, 37 Atl. 359, 38 L. R. A, 509J or used in submarine telegraphy, (see 25 Stat. 41 [U. S. Comp. St. 1901, p. 3586].)