. The principles and processes of cotton yarn manufacture. e method of numbering cotton roving and yarn is as follows: Insteadof basing the size on a yard a higher denomination called a hank is hank equals 840 yards. The size or count of a given piece of FLY FRAMES 167 roving or yarn is the number of hanks that would be required to makeone pound in weight. If two hanks, /. e., 2 x 840 yards, of a strand ofroving weigh just one pound the roving is called No. 2, or No. ^ of a hank weighs just one pound the roving is No. ^ or ^ will be observed that as the roving increase
. The principles and processes of cotton yarn manufacture. e method of numbering cotton roving and yarn is as follows: Insteadof basing the size on a yard a higher denomination called a hank is hank equals 840 yards. The size or count of a given piece of FLY FRAMES 167 roving or yarn is the number of hanks that would be required to makeone pound in weight. If two hanks, /. e., 2 x 840 yards, of a strand ofroving weigh just one pound the roving is called No. 2, or No. ^ of a hank weighs just one pound the roving is No. ^ or ^ will be observed that as the roving increases in fineness more hanks willbe needed to make a pound weight; consequently the finer the roving tliegreater is the number. It is customary to refer to roving as No. 5-hank,etc., while in the case of yarn merely the number is used, as No. 40 size of a given strand is found in practice by weighing a certainnumber of yards of it, and then by making a simple calculation. Twelve,24, 60 or 120 yards are variously taken, depending upon the fineness of. Fig. 115. the strand being tested. Let it be assumed that we wish to find the size ofsome roving, which has just been made. It would in this case be suf-ficient to take 12 yards. A skewer would be placed through the bobbinand supported in a device like the one in Fig. 115. By means of a reel ayard in circumference the desired length would be measured. On asmall pair of scales the weight of the 12 yards would be found. Theweight is most accurately found in grains, and the scales are arranged toweigh as fine as tenths of grains. Assume that the 12 yards weigh 30grains. In order to find the size we must find how much one hank of theroving in question would weigh. If 12 yards weigh 30 grains, t yardwould weigh ^ of 30 grains. Eight hundred and forty yards, or onehank, would weigh 840 x yV of 30 grains. Now, in one pound there are 168 COTTON YARN MANUFACTURE 7,000 grains. If one hank of the roving in question weighs 840 x yi ^ 30gr
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