3 BULLETIN 1488, U. S. DEPARTMENT OF AGBlCULTUBE 
The average of the total visible waste from each grade of the 
\ eastern and western cotton is shown graphically in Figure 1. Data 
Vised in this graph were taken from Table 4. The cross on each ver- 
tical grade line indicates the total amount of visible waste removed 
from that grade. These crosses have been connected by the dotted 
line for convenience in reading. The solid curve best represents the 
was ee. data. The method of locating this curve is to draw it among 
PERCENTAGE 
OF WA5"I 
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12 
10 
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98765^321 
GRADE NUMBERS 
Fig. 1.— Average percentage of total visible waste from eastern and western cotton of each of 
the nine grades. The crosses on the dash line indicate the actual waste removed in the test 
while the solid-line curve is the best representative line 
the points representing the waste percentages so that the sum of the 
squares of the distances of the points above the curve is equal to the 
sum of the squares of the distances below the curve. 
WASTE AND COTTON PER 500-POUND BALE 
The pounds of waste and of cotton per bale as found in this test 
are given in Table 5. 
The waste may be divided into two parts — spinnable and nonspin- 
nable. To the first class belong the flat strips which are the highest 
quality of waste removed from cotton used in manufacturing carded 
yarns. These are usually spun into coarse yarns, To the second class 
