. The Bell System technical journal . ing a number of turns of thetextile around the electrodes inserted in the stoppers as shown inFig. 8. Care is taken not to handle the textile itself during the windingprocess as perspiration from the hands is likely to contaminate thethread. Samples are left in the tank over night as there is considerable 252 BELL SYSTEM TECHNICAL JOURNAL evidence to show that several hours are required for them to cometo complete equilibrium. A temperature of 100 degrees Fahrenheitand relative humidity of 75 per cent has been found suitable forcotton testing and 100 degre
. The Bell System technical journal . ing a number of turns of thetextile around the electrodes inserted in the stoppers as shown inFig. 8. Care is taken not to handle the textile itself during the windingprocess as perspiration from the hands is likely to contaminate thethread. Samples are left in the tank over night as there is considerable 252 BELL SYSTEM TECHNICAL JOURNAL evidence to show that several hours are required for them to cometo complete equilibrium. A temperature of 100 degrees Fahrenheitand relative humidity of 75 per cent has been found suitable forcotton testing and 100 degrees Fahrenheit and 87 per cent relativehumidity for silk. The number of turns of yarn or thread wound around the electrodeswill vary with the size of the thread since the winding space is fixedand a single layer of thread is applied. For No. 30/2 cotton approxi-mately 90 turns, 180 parallel threads, have been found to give satis-factory readings. This same space accommodates about 256 turns,512 parallel threads, of No. 62/1 spun
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
