Indian Central Cotton Committee Technological Laboratory Random and Systematic Selections of Warp Specimens in Cloth Sampling October 1930

If strong and weak lengths alternated regularly then the strength of specimens in a warp strip would repeat at intervals; if the periods were the same for each yarn then the periodicity for the strength of the warp strips would be the same as for any of the yarns; but if the periodicities of the various yarns were different the periodicity of the warp strip would be equal to the lowest common m [...] (ii) Results of Tests The results obtained for the strengths of the specimens of the three fabrics are given in Tables I II and III in which the strength of each 2-inch specimen is given in pounds and shown in the table in the position occupied by the specimen. [...] Repeating the process once more we obtain in D 2 values one of which represents the sum of the values of the 8 specimens in the first half of the strip and the other represents the sum of the values of the 8 specimens in the second half of the strip. [...] Now if the test-results had been vitiated by the occurrence of periodicity of strength in the fabric coinciding with the periodicity of the selection of the specimens it is most unlikely that the relation between strength and humidity would be of a regular nature not only in one fabric but also in a number of fabrics of the same type. [...] Another reason for the belief that the results and conclusions are substantially correct is that in the case of each of the unweathered fabrics two sets of specimens were tested under the same set of conditions and except in four cases out of 56 the results for the two sets were well within the limits which might be expected from the values of the probable errors.