Abstract: A fluid loading device for marine application in the form of a fixed, vertical, hollow supporting member fluid connected to a transfer pipe, has mounted thereto one end of an inner hollow arm through a bi-directional swivel joint, allowing the inner hollow arm to rotate freely about vertical and horizontal axes. An outer hollow arm is rotatably mounted for rotation vertically by means of a hollow swivel joint to the outer end of the inner hollow arm about a horizontal axis and carries at its outboard end a swivel joint for rotation vertically and horizontally. Polygonal cam plates which rotate in response to rotation of the outer arm are mounted on the inner and outer ends of the inner hollow arm and rotate with the outer hollow arm and a balancing counterweight, respectively. The cam plates rotate in unison through a loop created by an endless array of end to end linked rods which have an individual length equal to 1/n times the length of one side of the polygonal cam plate, with n being an integer.