Cotton weaving: its development, principles, and practice . the name of thedobby attached, was an invention by Mr. S. Denn, of Spital-fields. This was an important improvement, as it accele-rated the shedding operation, and led the way to thenext improvement—the introduction of the double-actionprinciple in an invention patented in 1849 by Mr. AlfredBarlow. This also was a considerable step in advance,but showed some defects, which were subsequently obviatedby improvements made in 1855 and 1870. About 1858 aGerman invention on the same lines was introduced into THE DEVELOPMENT OF THE SHEDDING
Cotton weaving: its development, principles, and practice . the name of thedobby attached, was an invention by Mr. S. Denn, of Spital-fields. This was an important improvement, as it accele-rated the shedding operation, and led the way to thenext improvement—the introduction of the double-actionprinciple in an invention patented in 1849 by Mr. AlfredBarlow. This also was a considerable step in advance,but showed some defects, which were subsequently obviatedby improvements made in 1855 and 1870. About 1858 aGerman invention on the same lines was introduced into THE DEVELOPMENT OF THE SHEDDING MOTION. 211 Lancashire, and a considerable number of machines weremade by the Blackburn loom makers during the succeedingthree or four years when the introduction of the manufac-ture of bordered dhootie cloths for India took place. In1867 the dobby assumed a more perfectly developed typeas a shedding appliance, in the invention of the Keighleydobby by Messrs. Hattersley and Smith, than had been seenbefore. This dobby, with some subsequent improvements,. Fig. 138. has held a strong position to this day. Its construction isshown in the accompanying illustration, fig. 138, whichalso incorporates the improvement patented by Mr. , of Preston, in 1877. It is on the double-actionprinciple, one cylinder carrying two sets of cards insteadof two cylinders with a set of cards each. The illustrationshows the working details divested of the frame for thesake of clearness. Mr. Eccless improvement consisted in 212 . COTTON WEAVING. adapting it to work intermittently, so as to make cross-bordered dhooties, and in the intervals between their inser-tion to permit the loom to weave plain cloth. The illustra-tion shows a side elevation. The front crank lever, a, isone of a series mounted upon the shaft, b, which is sup-ported upon the machine frame. The long arms of theselevers are connected by cords, C, to the healds, the bentarm, d, being connected to a vertical rocking-bar, e. Thisbar
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