. The Bell System technical journal . Fig. 5—Changing spools and take-up. them had never seen a paper machine before but they became veryefficient in a surprisingly short time and there have been no prejudicesacquired on regular paper machines to overcome. Making Narrmv RibbonsThe question of making narrow uniform ribbons has given con-siderable trouble. The most satisfactory solution of this problem todate is the use of deckels or dams painted on the mold mechanically atspaced intervals. Apparently very good life can be expected fromsuch a mold. PULP INSULATION FOR TELEPHONE CABLES 11 Defecti
. The Bell System technical journal . Fig. 5—Changing spools and take-up. them had never seen a paper machine before but they became veryefficient in a surprisingly short time and there have been no prejudicesacquired on regular paper machines to overcome. Making Narrmv RibbonsThe question of making narrow uniform ribbons has given con-siderable trouble. The most satisfactory solution of this problem todate is the use of deckels or dams painted on the mold mechanically atspaced intervals. Apparently very good life can be expected fromsuch a mold. PULP INSULATION FOR TELEPHONE CABLES 11 Defective Wire It is necessary to mark defects in the completed wire by placing awhite tag in the winding in order that repairs may be made by thetwister operators, as there is no opportunity to make them at the pulpmachine take-ups. Short breaks in the insulation were often passed. Fig. 6—Stringing in a wire at polishers. unnoticed by the operators so a bare wire detector was put in whichsounds an alarm, indicates the spool position by a light and recordsthe break by number on a position counter and on a master any one spool shows excessive defects it is rejected. 12 BELL SYSTEM TECHNICAL JOURNAL General Physical CharacteristicsPulp insulation is a new product and has certain inherent charac-teristics. These characteristics may be modified somewhat by choiceof materials and methods of manufacture but they cannot be entirelycontrolled. A brief survey of these characteristics may be of interestto give a better picture of the possibilities and limitations of theproduct. This survey co\ers only 24 and 26 wire as these arethe sizes which have been run almost exclusively to date. It shouldbe noted, however, that wires ranging in a size from 19 to 28 been covered successfully. Some of the physical characteristics of the insulation are sho
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