Simply a cable through which telegraph signals were sent. It was heavy, copper and wound with lots of insulation of rubber and pitch.

The telegraph was installed on boats so they could communicate with the headquaters.

Samuel Morse was involved in the invention of the single wire telegraph system. This system was based on the European telegraph.

Gutta Percha is a flexible rubber-like material. It was used as an outside coating for the first transatlantic telegraph cable.

The nervous system, especially the spinal cord.