Psychic Phenomena XII, #26 - Margery, Boston Experiments
A glass plate negative of a diagram of Dr. Richardson's voice-control appartus, which was a piece of psychic equipment used with the medium, Margery, during seances with Dr. Crandon., Luna Collection ID - 28::UMANITOBALCM::NA, Luna Object ID - 82307, Luna Image ID - 118936
Psychic Phenomena XII, #27 - Margery, Boston Experiments
A glass plate negative of a diagram of the detailed view of a piece of psychic equipment called the glass mouth-piece, which was used in seances with Dr. Crandon and the medium, Margery., Luna Collection ID - 28::UMANITOBALCM::NA, Luna Object ID - 82311, Luna Image ID - 118937