What is a Lodestone Resonator?
A lodestone resonator is one of a number of fictional devices which appear in Philip Pullman’s His Dark Materials series of fantasy novels. The item allows two people to communicate over vast differences, even between the various universes which make up the world of the books. The lodestone resonator is introduced as an item used by the Gallivespians who are fighting against the Authority in the war against Heaven. It is not made entirely clear whether lodestone resonators exist solely in the universe the tiny race of Gallivespians hail from, or whether they can be found in many different universes. It does appear that the Gallivespians did at least invent their own lodestone resonators, though whether they invented them with the intention of communicating across universes, or simply for long-distance communication within their universe, is unknown.
