TABLE 12. TEST FOR TOTAL STRETCH OF BLACK POLYETHYLENE-COVERED 

 STEEL CABLE (100-FT LENGTH) 





Number of Turns 



Time 







Load 



To To 



From Start 



Stretch 





(lb) 



Unwind Wind 



(hr) 



(in. /50 ft) 



Notes 



39.0 













Special consecutive hourly 



521.0 







1.22 



measurements were made on 







72 



1.25 



one day to determine the effect 





29.75 







of temperature on the length 





26.00 







measurement. No effect was 





23.50 







noted. 





21.25 





1.62 





714.5 



12.50 



11.00 

 10.00 



9.00 



144 



2.00 







After rotating to still condition 



2.28 





905.0 



13.75 



11.50 

 10.50 



9.50 



168 



2.65 



2.78 







After rotating to still condition 



2.92 



The total stretch was 6 in/100' 





No rotation 



240 



3.00 



of cable; of this, 1-13/16" was 

 due to unwinding of the cable 

 under load. This rotational 

 stretch was approximately 30% 

 of the total stretch. 



29 



