Length measures of cotton fibers on a Fibrograph will appear about 6% short because of crimp. Fibrograph measurements must be started at a distance from the combs. The 50% span length is increased by half this distance. The 2.5% span length is increased by a negligible amount. The resulting uniformity index is increased by as much as 25%. An arithmetic determination of the average length of fiber held behind the front edge of the comb teeth gives a result of about 0.17 inches. This holding length is dependent upon the rigidity of the cotton, thereby causing a variable shortening of the measured length. Application of corrections for these Fibrograph parameters to fibrograms generated from array data compared well with the measured data presented in the literature in four of five cases examined.