Notes on the effect of heat on impregnated paper from cable insulation

THE tests outlined below were made to determine at what temperature marked deterioration in the paper of impregnated paper cable took place. There are many shots well off the target in these results, although the average were determined from something over six hundred readings. Anyone who is familiar with the manufacture of paper and with the handling of it, knows the wide variation which occurs in different parts of the same sheet. The maximum tensile strength in a series of tests is frequently twice the minimum.