INSULATION OF WIRE WITH PAPER PULP 



83 



due to the higher priced papers. Increased flexibility of paper without 

 sacrificing strength and greater uniformity were required in these new thin- 

 ner papers. Considerable time and money were spent in attempting to 

 reduce the amount of manila fibre due to its price and increased scarcity 

 and to substitute cheaper fibres of wood and cotton. It was finally found 

 that mixtures of 45% rope, 40% wood and 15% cotton could be used for all 



Fig. 1 — Paper strip insulating machine 



but the very finest insulating papers and that as high as 80% wood and 20% 

 manila rope could be used for the coarser wrapping papers. 



In spite of these changes and the improved paper making technique 

 developed by the industry the use of paper \" x .0025" for insulating 26- 

 gauge wire was not entirely satisfactory from a manufacturing point of 

 view. About 1920 some of our engineers began developing the idea of 

 manufacturing the paper right on the wire. If this were possible there 



