PROPERTIES AND VALUES OF CERTAIN FISH-NET PRE- 



SERVATIVES.^ 



By Harden F. Taylor, Chicf^ tcchnologiM, and Arthur W. Wells, Assistant tech- 

 nologist, U. S. Bureau of Fisheries. 



Contribution from the Fishery Products Laboratory, Washington, D. C* 



CONTENTS. 



Page. 



Introduction , 2 



General summary 3 



Preliminary experiments 5 



Conclusions from preliminary experiments 6 



Copper soap 6 



Experimental exposure and testing of lines 7 



Notation of samples 7 



Method of taking samples 9 



Series exposed to weather conditions at Washington, D.C 9 



Materials tested 9 



Tensile strength 10 



Summary of results of Washington experiments 12 



Series exposed in sea water at Key West, Fla 12 



Water conditions at Key West 12 



Materials tested 13 



Tensile strength 13 



Summary of results of Key West experiments 15 



Series exposed in sea water at Beaufort, N. C 16 



Water conditions at Beaufort 16 



Tests with cotton lines 16 



Materials tested 16 



Tensile strength 17 



Flexibility 19 



Method of measuring flexibility 20 



Results of flexibility tests 23 



Resistance to mechanical wear or abrasion (wearing quality) 24 



Method of measuring wearing quality 25 



Results of wearing tests 25 



Resistance to fouling by marine growths 28 



Tests with linen lines 29 



Materials tested 29 



Tensile strength 29 



Summary of results of Beaufort experiments 30 



Series exposed in sea water at Woods Hole, Mass 31 



W^ater conditions at Woods Hole 31 



Tests with cotton lines 32 



Materials tested 32 



Tensile strength 32 



Flexibility 34 



Wearing quality 35 



Tests with linen lines 36 



Materials tested 36 



Tensile strength 37 



Summary of results of Woods Hole experiments 37 



> Appendix I to the Report of the U. S. Commissioner of Fisheries for 1923. B. F. Doc. 947. 



* The Bureau of Standards, Department of Commerce, through its division of textiles, cooperated freely 

 with the Bureau of Fisheries in furnishing and testing the apparatus used for tensile strength, in providing 

 facilities in a room of coastant temperature and humidity for making the te.sts and the measurements of 

 tensile strength, in preparing graphs, and in making valuable suggestions and criticisms. 



