Seizings are used to hold two pieces of rope together. The rope lanyards on a mast’s standing rigging are passed through a wooden deadeye, which is seized into the cable. The deadeye has three holes in it. Another deadeye is attached to the ship. Rope is reeved through the holes from the deadeye on the cable to the deadeye on the ship. When the rope is hauled upon it tensions the cable by drawing the two deadeyes closer together. Once the peice of standing rigging is as tight as the rigger wants it to be, he/she uses seizings to hold the lanyard’s tension without losing any tension. Then he removes the tackles used to haul on the lanyard and ties the lanyard’s end to the cable with a cow hitch and seized the bitter end of the lanyard back down against the other parts of the lanyard.
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U.S. Brig NIAGARA - The Ship's Log 
An excellent demonstration, clearly explained and photographed . Must viewing
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