. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. in order to prevent any part frominterfering with the other partswhich are behind, by elevatingthem entirely above them. Theextremities of these arms at thetermination of the bends behind,are connected by a cross bar,which has also a circular bendin the middle, projecting down-wards, for a reason similar to thatalready assigned. This bend isconcealed in^g. 552, but visiblein the front elevation, fig. the middle of the bend,the presser is connected with themiddle treadle by
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. in order to prevent any part frominterfering with the other partswhich are behind, by elevatingthem entirely above them. Theextremities of these arms at thetermination of the bends behind,are connected by a cross bar,which has also a circular bendin the middle, projecting down-wards, for a reason similar to thatalready assigned. This bend isconcealed in^g. 552, but visiblein the front elevation, fig. the middle of the bend,the presser is connected with themiddle treadle by a dependingwire appearing at M,fig. 552, andthus, by the pressure of thattreadle, the presser is forced downto close the barbs of the re-ascent of the presser issometimes effected by means ofa counterpoising weight passingover a pulley behind ; and some-times by the reaction of a woodenspring, formed of a strong hooplike that represented at k. Thelatter of these is preferred, espe-cially by the Nottingham hosiers,because, as they assert, it makesthe presser spring up with greater 658 HOSIERY. 560. rapidity, and consequently saves time in working. How far this may be practically thecase, it would be superfluous here to investigate; but it is obvious that the wooden spring,if very stifi, must add much to the hosiers exertion of his foot, already exercised againstthe united spring of all his barbs; and this inconvenience is much complained of by thosewho have been accustomed to work with the counterpoise. At L are two pulleys or wheels, of different diameters, moving upon a common centre,by which the jack sinkers are relieved from the back springs, and thrown downwards toform the loops upon the needles. About the larger wheel is a band of whipcord, pass-ing twice round, the extremities of which are attached to what is called the slur, whichdisengages the jacks from the back springs. The smaller pulley, by another band,communicates with the right and left treadle; so tha
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
