428 



U. S. BUREAU OP FISHERIES 



Flexibility. — The great importance of flexibilit}' in many kinds of 

 fishing gear was discussed at some length in our previous paper on 

 this subject.^ Measurements made at 30-day intervals throughout 

 the period of submersion showed that the twine became more flexible 

 as its tensile strength decreased. The important factor to consider 

 is the change in flexibility of the twine immediately after treatment 



PS 



I- 



o 



IS 



2 3 4 



NUMBER Of MONTHS EXPOSED 



Fio. 13. — Wearing quality of cotton lines exposed at Fairport, Iowa 



with a preservative material. Inasmuch as this measurement had 

 already been made for most of the preservatives tested, and also on 

 account of the great amount of time and labor necessary to carry the 



' Properties and Values of Certain Fish-Net Preservatives, by Harden F. Taylor and Arthur W. Wells . 

 Appendix I, Report of the U. S. Commissioner of Fisheries, 1923, 69 pp., 35 flgs. Washington. B. F. 

 Doc. 947. 



