Glass as an Insulator.
Insulation first saw the use of glass with the use of glass insulated telegraph lines in the eighteen fifties. Further development saw telephone lines, electric power lines, etc., adopt glass for insulation purposes. Since then silicon dixode or teflon has reached advanced stages in uses and development. Polymers, which behave like rubber and plastics in advanced stages of development, form much of the materials used to insulate electrical wiring and cables.
Nevertheless, glass continues to be the desired object or material for insulation purposes. Certain applications can do with the use of glass, yet some opt for the use of glass inspite of being prescribed. These largely differ from region to location, and a number of other economic factors. As technology sophisticates itself, glass simply does not stand by itself unrecognized as a premium insulator. Design and construction technology continues to evolve with respect to glass as insulators.
Lightning rod insulators in the 1840s were in use to insulate lightning rods and cables. The year 1844 saw the installation of the first Morse telegraph line in between Baltimore and Washington. DC batteries with battery rest insulators were used for the functioning of this telegraph line. In the history of the evolution of insulators, the threadless insulator found a special place of mention much after the much talked about telegraph line. The design and construction of this pin type insulators consisted of a tie wire on a wood pin inside a groove of an inverted cup shape. These were also known as threadless insulators owing to the pinhole being considered plain and smooth.