HISTORY A1VD PROGRESS. 



197 



They are then laid together and wrapped or bound with gal- 

 vanised iron binding wire and soldered. 



By the other method the two ends are laid side by side 

 for about 5 inches, and each turned four or five times 

 round the other, with a space between the two helices of 

 about three-quarters of an inch. To make this joint, how- 



Fig. 109, 



ever, it is necessary that the wire should be quite soft at 

 the ends, a condition which must be seen to beforehand. 

 The ends are cleaned with emery paper or with a file, and 

 twisted together by means of a lever arrangement made 

 for the purpose. This consists of two bars of steel, a a 



Fig. 110. 



and//, Fig. 110. In the middle of a a is a clip, b, with a 

 vice- screw, c, for holding it down upon the wire. In the 

 middle of // is a block, perforated with a hole in the direc- 

 tion of the lever. The ends of wire to be joined together 

 are laid into the half-circular cavity in the bed of the clip 

 from opposite sides, each end projecting about 8 inches 

 beyond the lever. They are secured in this position by 

 screwing the clip down upon them by the screw c. The 

 projecting end of one of the wires is then bent upwards at a 

 right angle and put through the long hole in the block of 

 the hand-lever. While one man holds the handles of the 

 clip a a, another turns the lever // and with it the end of 

 the bent wire, round the straight one as many times as its 



