An instrument created in the early 1930s to facilitate the reception of scientifically evidential communications with the spirits of the dead. It was a product of the ASHK1R-JOBSON Trianion guild, which grew out of the work of three British researchers, A. J. Ashdown, B. K. Kirby, and George Jobson. Jobson died in 1930 and purportedly gave instructions for the construction of a communigraph through a medium.
The instrument consisted of a pendulum hanging from underneath a table. The swinging pendulum could make contact with a set of small metal plates representing the alphabet. Upon making contact, a circuit was closed and the corresponding letter was illuminated upon the face of the table. According to claims, even in the absence of a medium, people could sit in a circle around the communigraph and the pendulum would begin to swing on its own (through the spirits) volition and messages would be spelled out.