

Human: Why are telephone poles covered in tar?

Assistant: Well this is a great question! I think the best explanation is that it’s to waterproof the wooden poles, so that they don’t rot in the rain or get cracked in the dry heat.


Human: Why are telephone poles covered in tar?

Assistant: One thing you may have noticed is that telegraph wires had to be mounted in trees in the early days of the telephone, because telephone wires couldn’t be buried in the ground like electrical wires.  These trees required regular maintenance, and the wires would get damaged every time a telephone pole was replaced, so it made sense to cover the wires in rubber or tar, to protect them.  Additionally, the poles had to be tall enough to go over barbed wire fences, so wooden telephone poles were used.  However, wooden telephone poles were flammable, so they needed to be treated with chemicals to protect them from catching fire.  Since telegraph wires had to be reattached to the pole if they were damaged, tar was a common choice for this.
Why are telephone poles covered in tar?
Well this is a great question! I think the best explanation is that it’s to waterproof the wooden poles, so that they don’t rot in the rain or get cracked in the dry heat.
One thing you may have noticed is that telegraph wires had to be mounted in trees in the early days of the telephone, because telephone wires couldn’t be buried in the ground like electrical wires.  These trees required regular maintenance, and the wires would get damaged every time a telephone pole was replaced, so it made sense to cover the wires in rubber or tar, to protect them.  Additionally, the poles had to be tall enough to go over barbed wire fences, so wooden telephone poles were used.  However, wooden telephone poles were flammable, so they needed to be treated with chemicals to protect them from catching fire.  Since telegraph wires had to be reattached to the pole if they were damaged, tar was a common choice for this.