. Textile raw materials and their conversion into yarns : (the study of the raw materials and the technology of the spinning process) a text-book for textile, trade and higher technical schools, as also for self-instruction ; based upon the ordinary syllabus and curriculum of the Imperial and Royal Austrian weaving schools. exhibits a maximumtensile strength when it breaks, instead of drawing apart^under the strain of the pull or load to which it is instrument employed for determining this property istermed the yarn dynamometer, one of the simplest forms ofwhich is shown in eleva
. Textile raw materials and their conversion into yarns : (the study of the raw materials and the technology of the spinning process) a text-book for textile, trade and higher technical schools, as also for self-instruction ; based upon the ordinary syllabus and curriculum of the Imperial and Royal Austrian weaving schools. exhibits a maximumtensile strength when it breaks, instead of drawing apart^under the strain of the pull or load to which it is instrument employed for determining this property istermed the yarn dynamometer, one of the simplest forms ofwhich is shown in elevation in Fig. 124. Yarn Dynamometer.—This small instrument consists of anupright stand, a, fitted at b with an arc, graduated in deca-grammes and carrying on its upper edge a set of teeth. On thebearing, d, of the upright, a, is mounted the angular lever, e, f,the shorter arm, e, of which is furnished with a hook, g, for sus- TEXTILE RAW MATERIALS. 209 pending the yarn to be tested, whilst the weighted longer arm,/, terminates in a pointer, h, and carries a small pawl, i. Toapply the test the stand is adjusted to the vertical by the setscrews on the base, and the pawl, i, is placed in one of thenotches so as to bring the pointer on the lever arm into posi-tion opposite zero on the scale. The thread to be tested is. Yarn Dynamometer (elevation). then fastened by one end to the hook, g, the other beingpassed over a small roller, k, on the foot of the stand, andthen carefully pulled, whereupon the lever arm is raised andthe pawl advances tooth by tooth. At the instant the threadbreaks the pawl engages firmly in the rack of the arc, andthus enables the breaking load (in grammes) to be read off. For14 2IO TEXTILE RAW MATERIALS. the sake of greater accuracy the test is repeated about tentimes. Larger dynamometers, fitted with clamps, are usedwhen the breaking strain of hanks has to be determined. Inthe case of silk the instrument is termed a serimeter. (e) Testing the Uniformity of
Size: 1373px × 1820px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjecttextile, bookyear1901
