rrvESlillVATlOX OK FISH NKTS. 



17 



The test pieces taken up October 1 were covered with mussel spat, 

 and were »j:reatly reduced in stren<j:th. By the time the fifth test was 

 made the nets had so far disinte^^rated that they couhl not be tested 

 on the dynamometer; the investi»T:at()r therefore made notes with the 

 letters, a, h^ and e to indicate how far <;one they were, meaning some- 

 thin<2: like poor, })oorer, poorest. 



It is apparent that the pieces of net used for the fourth and fifth 

 tests underwent decomposition much more rapidly than the earlier 

 ones. AVhile Lindeman offers no explanation of this difference, it 

 may be readily explained by the warm w^eather, since it is common 

 experience that nets rot more rapidly in Avarm weather than in cold. 



The results of these tests are summarized in the accompanying 

 table. Each figure rei)resents an average of from 5 to 13 trials, so 

 that differences in particular places on the thread a'-e ironed out to 

 some extent. 



strength and weight of thread . 



A. HEMP. 



Test 1: 



Breaking load kilogram.. 



Weight per meter gram . . 



Breaking length kilometer. . 



Test 2 : 



Breaking load kilogram. . 



Weight per meter gram. . 



Breaking length kilometer. . 



Test 3: 



Breaking load .' kilogram. . 



Weight per meter gram. . 



Breaking length kilometer . . 



Test 4: 



Breaking load kilogram. . 



Weight per meter gram. . 



Breaking length kilometer. . 



Test ,5: 



Breaking load kilogram. . 



Weight per meter gram.. 



Breaking length kilometer. . 



B. COTTON. 



Test 1: 



Breaking load kilogram . . 



Weight per meter gram.. 



Breaking length kilometer. . 



Test 2 : 



Breaking load kilogram. . 



Weight per meter gram. . 



Breaking length kilometer. . 



Test 3: 



Breaking load kilogram. . 



Weight per meter gram . . 



Breaking length kilometer. . 



Test 4: 



Breaking load 1 ilogram . . 



Weight per meter gram.. 



Breaking length kilometer. . 



Test 5: 



Breaking load kilogram.. 



Weight per meter gram . . 



Breaking length kilometer. . 



Without Blue- 

 prepara- stone, 

 tion. 



13.3 

 .600 

 22.2 



8.6 

 .554 

 15.7 



6.4 

 .509 

 12.5 



7.8 



.558 

 13.9 



.497 

 7.6 



.3 



.530 

 4.4 



12.6 

 .675 



18.7 



11.2 

 .593 

 18.9 



11.8 

 .646 

 18.3 



9.0 

 .804 

 11.2 



(") 



8.2 

 .507 

 16.1 



.493 

 15.6 



7.0 

 .564 

 12.8 



2.7 

 .489 

 5.5 



(0 



Birch 

 bark. 



11.5 



.628 

 18.3 



9.1 

 .660 

 13.8 



.652 

 14.9 



4.6 

 .732 

 6.3 



(0 



7.8 

 .538 

 14.5 



6.1 

 .5.30 

 11.5 



3.8 

 .577 

 6.6 



2.8 

 .536 

 5.2 



(O 



Note.— a, ft, and c, meaning something like poor, poorer, poorest, indicate that nets had disintegrated too 

 far to be tested on the dynamometer. 



51700°— 21 21 



