171 L ^' ' i 



g,-rewed into the grooves ia the periphery of the pulley 2; the pulley 

 2 is fixed to the side of another pulley 18, eccentric to the axis ot the 

 axle S, by which means the power to turn the axle of the draw-boy 

 increases as the treadles are depressed. Z, is another axle which turns 

 on two conical steel centres, similar to those which support the axle 

 S; to one end of the axle Z is fixed an iron wire 19, having a slit 

 along it, through which a screw passes for fixing a weight 20, at any 

 required distance from the centre of the axle; on the other end of 

 the axle Z, is fixed a pulley 21, perpendicular to the pulley 18 on the 

 axle S, each of which has two grooves on their respective peripheries; 

 22 and 23 are two cords, which are passed round the pulleys in con- 

 trary directions; the upper ends are fixed to the pulley 18 and the 

 lower to 21; by which means the motion of the axle S is commu- 

 nicated to the axle Z. Now, suppose the treadles were level with 

 each other, the weight 20 would be perpendicular above the axle Z, 

 and would tend to turn it either way; consequently, as one of the 

 treadles is depressed, the weight will pass to one side or the other of 

 the axle, and its leverage power will be increased till the centre of 

 ' gravity of the weight 20 has arrived horizontal with the axis of the 

 axle Z; it will be obvious, that either by increasing the weight 20, 

 or extending it further from the axle, the power will be increased; and 

 by combining the eccentricity of the pulley 2, with the eccentricity 

 of the weight 20, the power applied to the treadles may be increased 

 so as to counterbalance any number of lambs or beadles, and the 

 weight appended to them, and to the false tail, together with the 

 power required for raising or opening the warp for the shuttle to pass 

 through. 



Another of Mr. Richards' improvements, is the application, with 

 certain modifications, of box 24, called the tabby box, which is fixed 

 to the axle S, and has a semicircle 25 fixed to it, similar to the figure 

 box, but without the clicks, &c. To the under part of the box 24, is 

 fixed a wire rod 26, which passes easily through the figure box, and is 

 supported by a staple 27, near the end of the axle, through both of 

 which it is at liberty to slide to and fro. 



28 and 29 are two sliding sockets, which can be fixed on the wire in 

 any required place, by a set screw in the side of each. 



The use of the tabby box is to raise a certain set of the lambs, or 

 beadles, to work the plain part of the silk, between the figures, with- 

 out having so much lash tied to each of the strings, r r, &c. To ad- 

 just the tabby box for weaving figured cloth with a plain ground, the two 

 sliding sockets 28 and 29 must be fixed on the wire rod 26, in their 

 situations as shown in fig. 4; two strings, or lashes, must also be fixed, 

 in a similar manner as those already described at r r, on each side of 

 the axle opposite the tabby box, and passed through the staples 30 and 

 31; see fig. 3, (only part of the rails on one side of the axle which the 

 staples are fixed in, is shown here, but the other side is fitted up in u 

 similar manner.) Suppose the loom was already prepared to weave 

 the figure as represented at fig. 6, and to commence at the line 30; the 

 treadles being put in motion., will cause the axle to vibrate, the draw- 



