MANUFACTURTKCJ TESTS OF COTTON. 3 



A few samples of fumigated and nonfumigated Peruvian and 

 Chinese cottons were secured from the mills and chemical laboratory 

 tests were made on these cottons in the department of chemistry and 

 dyeing of the New Bedford Textile School. 



METHODS OF COMPARISON. 



Each bale was given a mark so that it could not readily be identi- 

 fied while in the manufacturing processes as to whether it had been 

 fumigated. The fumigated and nonfumigated cottons of each lot 

 ^ere opened and left standing overnight. They were run through 

 the machines under the same conditions of speeds and settings, and 

 where possible the fumigated and nonfumigated portions of each lot 

 were placed side by side on the same machine, advancing together 

 through the various processes of manufacture. Between each run the 

 machines were cleaned thoroughly. Total weights were taken before 

 and after the cotton was fed into the opener, finisher, cards, and 

 combers respectively. Records of humidity were taken hourly and 

 the humidifiers regulated accordingly, keeping the relative humidity 

 as nearly uniform as possible for the respective lots. 



WASTE PERCENTAGES. 



Table I gives the comparative waste percentages of the fumigated 

 and nonfumigated cotton. 



Lots No. 1 and No. 2 represent respectively the 1^-inch staple and 

 the l|-inch staple, fumigated and nonfumigated cotton given sepa- 

 rately, which were tested at the New Bedford Textile School, New 

 Bedford, Mass. Lots No. 3 and No. 4 represent a digest of the 

 reports received from the two manufacturing firms. 



Table I. — Waste percentages. 



[Based on net weight of cotton fed into each macliine.] ■ 





Lot No. 1. 



Lot No. 2. 



Lot No. 3. 



Lot No. 4. 



Kindof v/aste. 



Fumi- 

 gated. 



Non- 

 fumi- 

 gated. 



Fumi- 

 gated. 



Non- 

 fumi- 

 gated. 



Fumi- 

 gated. 



Non- 

 fumi- 

 gated. 



Fumi- 

 gated. 



Non- 

 fumi- 

 gated. 



Opener: 



Visible- 



0.67 

 1.06 



0.25 

 1.50 



0.46 



.87 



0.33 



.67 





' 













i.45 



1.47 











Total visible 



1.73 

 2.53 



1.75 

 1.75 



1.33 

 .29 



1.00 

 .62 



0.65 



.83 



.53 



.55 



1.45 

 .05 



L47 



Invisible 



.03 







Total visible and invisible.. 



4.26 



3.50 



1.62 



1.62 



1.48 



LOS 



1.50 



L50 



Finisher: 

 Visible- 

 Dust room 



.14 

 1.43 



.14 

 .96 



.09 



.74 



.09 











Motes and fly 



.65 







.47 



.48 











Total visible 



1.57 

 1.14 



1.10 

 .13 



.83 

 .18 



.74 .78 

 .04 1.15 



.63 

 .61 



.47 

 .03 



.48 



Tnvisihlp, . , . . 



.03 







Total visible and invisible.. 



1,43 



1.23 



1.01 



. 78 1. 93 



1.24 



.50 



.51 



1 Invisible gaiB, not loss, as aresult of weather conditions. 



