The first insulators had nothing to do with telegraph wires or electrical wiring and were used to protect homes against lightning strikes.
However, these small glass cups were a vital element in the development of massive communication technologies as they helped telegraph and telephone wires keep their electrical currents.
This consistent flow of electrical energy allowed for speedy connections that simultaneously connected people around the world.
Nowadays they make a lovely display on a shelf & catch the sunlight.
Colour of this one is a deep Amber.
Size - 9cm high each.