. 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. rsion (concave)lens, which is placed in front of the object glass, and is cutdiametrically into two equal pieces, which can be mutuallyadjusted (in the direction of the cut) by means of a micrometerscrew, the vernier being graduated in 0^0 of an inch. Thewool fibre to be me
. 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. rsion (concave)lens, which is placed in front of the object glass, and is cutdiametrically into two equal pieces, which can be mutuallyadjusted (in the direction of the cut) by means of a micrometerscrew, the vernier being graduated in 0^0 of an inch. Thewool fibre to be measured is stretched at right angles to theline of intersection, and is thus visible to the observer asmagnified 50 times. On then adjusting the two halves ofthe dispersion lens two views of the object appear, as clearly TEXTILE RAW MATERIALS. ^7 shown in Figs. 26, 27. The extent of the adjustment is equalto the breadth of the object, and is read off (in a 50-fold stateof magnification) on the vernier, each degree on which is thusequal to 0^0^ 50 = to^oo part of an inch (= 1° D). In practice, however, this theoretical measurement of fine-ness is not employed, the estimation being made by the eye,or else indirectly by counting the number of crinkles in thefibre. This can easily be done with the aid of Sorges wool. Fig. 28.—Wool Classifier (front view). classifier (Fig. 28), which consists of a revolving hexagonalbrass plate, the sides measuring 26 mm. (1*023 inch) each andbeing provided with uniform teeth of progressively increasingfineness. The whole is mounted in a forked handle, so thatit can be turned round as required, and opposite each set ofteeth are engraved initial letters expressing the degree offineness, with figures indicating the corresponding degree,according to the DoUond eriometer, viz. :— (2) E (Electa) 7°D (3) P (Prima) 8°D (4) S (Secunda) gB (5) T (Tertia) io°D (6) Q (Quarta) II D 68 TEXTILE RAW MATERIALS. (I) SE (Superelecta) 6° D on the side carr
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttextile, bookyear1901
