MANUFACTURING LEAD-COVERED TELEPHONE CABLE ?,?,2, 



that, although different sizes of wire may be handled, the resistance 

 of the wire between the clamps is so large in proportion to the total 

 resistance that it automatically controls the current and prevents 

 overheating of the wire. 



Splices in the insulating paper are made by the application of a 

 thin strip of gummed paper. 



New twisting machines for non-quadded light gauge wire have been 

 developed and these machines have some unique features which are 

 worth a word of explanation. Fig. 10 shows schematically the old 



OLD METHOD NEW METHOD 



Fig. 10 — Schematics of old and new type twisters 



type of twister used ten years ago in which the two spools were placed 

 with axes vertical inside of a flier which carried guide bushings through 

 which the wire from the two spools was brought up to the center of the 

 yoke and to the capstan. These machines operated at 500 R.P.M. 

 and produced one twist per revolution. Assuming a 3-in. twist, the 

 output would be about 125 feet per minute. In the new machines the 

 spools are mounted side by side in a flier, the spools not revolving 

 around each other, with axes horizontal, and the wire from each is 

 taken off in a downward direction around a guide pulley and then up 

 through the flier, around another guide pulley and to the capstan. 

 With this arrangement two twists per revolution of the flier are pro- 

 duced and, as the machine is built to operate at 1,000 R.P.M., the out- 



