A deadeye is an item used in the standing rigging of old sailing ships. It is a smallish round thick wooden disc with a number of holes through it, vertical to the plane of the disc; there are usually three holes. They are used in pairs; a line is run back and forth between them, through the holes (in sequence), so that they function much as a pair of pulleys would, to provide mechanical advantage, pulling harder on whatever the deadeyes are attached to. Pairs of them are placed in the shrouds (the lines that hold up the mast), where they are used to create greater tension in the shrouds. On a sailing boat, the standing rigging is that collection of lines which are fixed. ... Traditional wooden cutter beating. ... A tree trunk as found at the Veluwe, The Netherlands Wood is an organic material found as the primary content of the stems of woody plants, especially trees, but also shrubs. ... In mathematics, a plane is the fundamental two-dimensional object. ... Coils of rope used for long-line fishing A rope is a length of fibers, twisted or braided together to improve strength, for pulling and connecting. ... A pulley is a wheel with a groove along its edge, for holding a rope or cable. ... In physics and engineering, mechanical advantage (MA) is the factor by which a machine multiplies the force put into it. ... mizzen mast, mainmast and foremast Grand Turk The mast of a sailing ship is a tall vertical pole which supports the sails. ... In physics, tension is a force on a body directed to produce strain (extension); it can be considered to be negative compression. ...