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BELL SYSTEM TECIIMCAL JOURNAL 



An early experimental machine is slunvn in V"\%. 2. At the bottom 

 are the supply reel and the motor driven take-up reel. The cellulose 

 acetate solution is in the small tank near the bottom The wire passes 

 around the immersion pulleys, shown raised for threading, then past 

 wipers into the drying chamber, over an upper pulley, and down, for 

 a total of four passes, which was later increased to six passes. 



Fig. 



•A later experimental machine, equipped with rotating dies for removing 

 the excess cellulose acetate and pressing down the te.xtile fibers. 



It was found that stationary wipers quickly became clogged by a 

 mixture of lint from the textile serving and half dried cellulose acetate 

 solution, and the rotating dies shown in Fig. 3 were designed. These 

 dies are the heart of the machine and their construction and adjust- 

 ment were found to be critical. It was necessary that they should 

 allow wire splices and enlarged places in the textile insulated wire to 

 pass, and to permit this the right hand dies were carried on spring 

 arms allowing them to back away. They were driven in the same 



