Abstract
It has long since been in practice to protect telephone and power cables with a lead or lead alloy sheath. on the other hand, studies have been made on substitutes for such sheath. Quite lately, we have succeeded in the manufacture of aluminum-sheathed telephone and power cables. According to the process developed by us, cable cores are first drawn into a long aluminum pipe and then the pipe is compressed by a die so that it may closely tighten the cores, Therefore, the aluminum sheath is seamless and free from pinholes or any other defects and regarded as an ideal tubular sheath.The results of various tests made by us show that the aluminum sheath is superior to lead sheath in respect of resistance against vibration fatigue, mechanical strength and strength against creep. Moreever, it is much lighter than, and can compare favourably with, lead sheath in point of anti-corrosiveness in case it is used for aerial cables. Aluminum sheathed cables can also be installed or jointed more easily and securely than lead sheathed cables.The results of the actual installation and jointing of thousands of meters of our aluminum sheathed cables by way of trial testify to the aforesaid merits. It is safe to say that they represent a novel type of cables rather than mere substitutes for lead sheathed cables.
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