ROPE-MAKING 



717 



proceed over the three guide-pulleys K, K, K, towards the laying-top M, and finally 

 pass through the tube o, to be wound upon the cable-reel D. The frames of the 

 three bobbins H, H, H, do not revolve about the fast pillar A, as a common axis ; but 

 each bobbin revolves round its own shaft Q, which is steadied by a bracing collet at 

 N, and a conical step at its bottom. The three bobbins are placed at an angle of 120 

 degrees apart, and each receives a rotatory motion upon its axis from the toothed spur- 

 wheel B, which is driven by the common central spur-wheol c. Thus each of the 

 three secondary cords has a proper degree of twist put into it in one direction, while 

 the cable is laid, by getting a suitable degree of twist in an opposite direction, from 

 the revolution of the frame or cage G, G, round two pivots, tho one under the pulley E, 

 and the other over o. The reel D has tlnis, like the bobbins H, H, two movements ; 

 that in common with its frame, and that upon its axis, produced by tho action of the 

 endless band round the pulley E, upon one of its ends, and the pulley E' above its 

 centre of rotation. The pulley E is driven by the bevel mill-gearing p, r, p, as also 

 the under spur-wheel c. r, in fig. 1729, is the place of the ring ^,fig. 1731, which 

 bears the three guide-pulleys K, K, K. Fig. 1734 is an end view of the bobbin H, to 

 show the worm or endless screw J, of fig. 1729 working into the two snail-toothed 



1729 



wheels, upon the ends of the two feed-rollers i, i, which serve to turn them. The 

 upright shafts of J, J, receive their motion from pulleys and cords near their bottom. 

 Instead of these pulleys, and the others, E E', bevel- wheel gearing has been substituted 

 with advantage, not being liable to slip, like the pulley-band mechanism. The axis 

 of the great reel is made twice the length of the bobbin D, in order to allow of the 

 latter moving from right to left, and back again alternately, in winding on the cable 

 with uniformity as it is laid. The traverse mechanism of this part is, for the sake of 

 perspicuity, suppressed in the figure. 



Mr. William Norvell, of Newcastle, obtained a patent for an improvement adapted 

 to the ordinary machines employed for twisting hempen yarns into strands, affording, 

 it is said, a simpler and more eligible mode of accomplishing that object, and also of 

 laying the strands together, than had been theretofore effected by machinery. 



