TESTS OF OFFICIAL COTTON STANDARDS FOR GRADE. 
13 
Figure 7 represents graphically the compaiative tensile strength of 
22 's yarn, manufactured with 4.76 constant, made from the five dif- 
ferent grades of cotton originating in the various zones (see fig. 1). 
The tensile strength is in pounds per skein of 120 yards with the 
downward stroke of the traverse moving at the rate of 12 inches per 
minute. The figures in the table in the lower part of the graph were 
taken from Table V and placed here for convenient reference. 
Fig. 7.— The tensile strength of 22 's yarn made with 4.76 twist constant from five grades of cotton from each 
of the several zones. (Textile school tests.) 
WEATHER, RELATIVE HUMIDITY, AND MOISTURE CONTENT DURING 
SPINNING TESTS. 
(Mill and textile-school tests.) 
The condition of the weather, relative humidity, and moisture con- 
tent were taken into consideration during the entire time that the 
mill tests and the textile-school tests were in progress. The differ- 
