Abstract
A new brand of copper has been developed which, by virtue of increased resistance to annealing, permits higher current-carrying capacity and longer useful life under load with no significant loss in conductivityv. The annealing characteristic of copper is influenced by a number of factors: 1. The effect on annealing of noncuprous elements is the resultant of a complex interrelationship due to many variables and the net result appears to depend primarily on the ore and refining processes. 2. The effect of continuous heating is to start annealing immediately at a rate depending on the temperature and type of copper. 3. The effect of intermittent heating is directly cumulative. 4. The effect of externally-applied tension is to increase the rate of annealing. These data enable continuous and short-time current-carrying capacities of over-head lines to be calculated more accurately.
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