TABLE 1 - List of Cables Tested 



(1) 



(2) 



(3) 



W 



(5) 



(6) 



(7) 



Desig- 

 nation 



Diameter 



inches 



Length 



feet 



Lay 



Weight 



pounds 



Weight per Unit 

 Length 



pounds per foot 



Weight per Unit 

 Length in Water 



pounds per foot 



A 



1/1 6 



61.65 



1 9 wire 

 strand 



0.047 



0.0076 



0.00679 



B 



1/1 6 



61.05 



7 X 7 



0.0446 



0.0073 



0.00638** 



C 



1/1 6 



60.27 



7 X 7 



0.0446 



0.0074 



0.00638** 



D* 



1/1 6 



53.73 



7x7 



0.0436 



0.0081 



0.00693 



E 



1/8 



63.20 



7 X 7 



1 .696 



0.0268 



0.0223 



P 



1/8 



59.79 



7x19 



1.746 



0.0292 



0.0249 



G 



1/8 



61.08 



7x19 



1 .916 



0.0314 



0.0268 



H 



1/4 



53.58 



7x19 



5.586 



0.1042 



0.0889** 



*Thls 



cable was pa 



Inted. 











*»Thes 



e values were 



obtained f] 



-om measuremei 



its of similar cable obtained from s 



tock. 



Some of the data tabulated in Table 2 are presented graphically in 

 Figures 3 and 4. The lines shown in Figure 3 are drawn at the average values 

 These average values are measures of C and are tabulated below 



sin^?" 

 in Table 3. 



Because this reanalysis of the experiments was undertaken such a 

 long time after the original data were obtained there are naturally some ques- 

 tions regarding the data, which, in the absence of .the personnel who original- 

 ly conducted the experiments, could not be clarified. To begin with, the orig- 

 inal figures for the weights of the cable in water could not be considered re- 

 liable and some doubt must be cast on the accuracy of the reweighings, since 

 the reweighings were made two years afterward, the cables having suffered some 

 corrosion in the interim.* It will be noted from Equations [7] and [8], how- 

 ever, that an error in w only introduces a constant-percentage error in C 

 and C , so that the manner in which these coefficients vary is not affected. 



Cv- 



In particular, if 



sln2(?i 



is Independent of <i> an error in w will not affect 



this relationship. 



An error of smaller magnitude but of a more serious nature may be 

 present in the determination of the direction of the cable. Inasmuch as the 

 direction of the cable Is measured by means of a fixed transit and a telescope 

 travelling in a fixed path, it is apparent that any error in the geometry of 



*The drying and chipping of the paint on the cable designated "D" make the weight of this cable 

 particularly uncertain. 



