A Critical Study of Cotton Manufacturing Processes

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Abstract
Doubling does improve uniformity of counts of cotton strands. Graphs of the average of 6-inch lengths of sliver taken from random spots show that number irregularity is decreased as the strands are doubled through successive manufacturing processes. The combinations of the weights of the random spots according to the cans (sliver) from which they were taken show much less spread around the mean of the mass after having been doubled through each successive process. These results are mathematically logical. Results indicate that doubling also decreases the variability of cotton strands within short distances. Calculated or expected "after doubling" variability was determined by dividing the "before doubling" variability by the square root of the number of strands doubled. Correlations between the actual and the expected results are very high, and indicate that the degree of reduction in variability by doubling is equal to the reciprocal of the square root of the number of strands doubled.

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