A
lightning rod, also known as a
lightning conductor, is a
metal rod that is installed on a structure to protect it from
lightning
strikes. If lightning strikes the structure, it will strike the rod first and be carried to the
ground via a wire, rather than going through the structure, where it could cause a fire or
electrocution.
Finials,
air terminals, and
strike termination devices are all terms used to describe
lightning rods.
A lightning rod is one of the system's components of a lightning protection system. To accomplish its protective role, the lightning rod must be connected to the earth. Lightning rods can be
hollow, solid, pointed, rounded, flat strips, or
even bristle brush-like in appearance.
All lightning rods have one thing in common: they're all comprised of conductive materials like
copper
and
aluminum. The most frequent materials used in protective devices are
copper
and
copper alloys.
Benjamin Franklin devised the pointed
lightning rod conductor, also known as a
lightning attractor or
Franklin rod, in
1752 as part of his pioneering investigation of
electricity.
Franklin was the first to offer a system for testing his hypothesis, although not being the first to identify a link between
electricity
and
lightning.
'The
electrical
fire would, I believe, be dragged out of a cloud silently, before it could come near enough to hit,' Franklin
speculated, using an iron rod honed to a point. Before his alleged kite attempt,
Franklin theorized on lightning rods for several years.