Measuring devices placed in the chamber to calculate the force of the blast were themselves destroyed by the blast , while the skull of the dummy representing King James , which had been placed on a throne inside the chamber surrounded by courtiers , peers and bishops , was found a large distance away from the site . Measuring devices placed in the chamber to calculate the force of the blast were themselves destroyed by the explosion ; the skull of the dummy representing King James , which had been placed on a throne inside the chamber surrounded by courtiers , peers and bishops , was found a considerable distance from the site .