Element of Cabl 
Direction of Motion 
Figure 16 - Resolution of Hydrodynamic Force Acting 
upon an Element of Cable 
along the cable from the origin O would lead upstream. In this case the 
positive direction of Y may be chosen arbitrarily. 
The aistance along the cable from the origin O to the arbitrarily 
chosen point P on the cable is denoted by s. Distances along the cable to 
points that are reached by proceeding from the origin O in the direction of 
increasing Y are measured in a positive sense, whereas distances along the 
cable from the origin O to points that are reached by proceeding from the 
origin O in the direction of decreasing Y are measured in a negative sense. 
The angle of the cable to the stream at the arbitrarily chosen 
point P is denoted by @ and is measured from the positive X-direction to the 
positive direction of the tangent at the point P. The positive direction of 
tne tangent to the cable at P is determined by the direction of increasing s. 
The angle of the cable to the stream at the origin O is denoted by @o. 
The tension in the cable at the arbitrarily chosen point P and at 
the origin O are denoted by T and Ty, respectively. 
