A guild of psychical researchers formed during the 1930s in Britain to develop apparatus to facilitate communication with spirits of the dead. The name derived from the individuals concerned: George Jobson (an engineer who first introduced the telephone into Britain), A. J. Ashdown, and B. K. Kirkby, and was associated with the mediumship of Mrs. I. E. Singleton (who became warden of the Ashkir-Jobson Trianion Guild).
Jobson, Kirkby, and Ashdown were preoccupied with the question of proving survival after death, and they formed a pact that whoever passed away would attempt to communicate with his comrades through an agreed signal—the initials "B. K. K." In 1930, within three months of the passing of Jobson, the signal was received through a medium not formerly known to the three, and thereafter instructions were communicated for the construction of instruments to facilitate spirit communication. The Ashkir-Jobson Trianion was formed as a nonprofit guild to produce apparatus, which included the Reflectograph and Communigraph. Another instrument, named the Ashkir-Jobson Vibrator, was designated to produce a continuous musical tone to create a harmonious influence at séances. The vibrator was operated by clockwork, which activated an "A" tuning fork, sending out sonorous but subdued sound vibrations, sustained for up to three hours.