. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. of in-terstices or gates, in the other this means the whole series ofcarriages receives successive sidesteps to the right in one bolt, and tojthe left in the other, so as to per-form a species of countermarch, inthe course of which they are madeto cross and twist round about thevertical warp threads, and thus toform the meshes of the net. The number of movements re-quired to form a row of meshes inthe double tier machine, that is, in aframe with two combs or bars, and2 rows
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. of in-terstices or gates, in the other this means the whole series ofcarriages receives successive sidesteps to the right in one bolt, and tojthe left in the other, so as to per-form a species of countermarch, inthe course of which they are madeto cross and twist round about thevertical warp threads, and thus toform the meshes of the net. The number of movements re-quired to form a row of meshes inthe double tier machine, that is, in aframe with two combs or bars, and2 rows of bobbins, is six ; that is,the whole of the carriages (with their bobbins) pass from one bar or comb to the othersix times, during which passages the different divisions of bobbin and warp threadschange their relative positions 12 times. This interchange or traversing of the carriages with their bobbins, which is the mc«tdifficult thing to explain, but at the same time the most essential principle of the lace-machine, may be tolerably well understood by a careful study of fig. 613, in which the123456789. 613 m\ mm lilL m Tnrrr M>
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
