In the last days of May and the first days of June 1960, Psychic Observer editor Tom O’Neil and researcher Andrija Puharich attended a series of materialisation séances at Camp Chesterfield, Indiana. They hoped to record evidence supporting Spiritualism. Their published conclusion was instead that people had entered from an adjoining doorway and performed as spirits. This case concerns that particular investigation and its documentary record.
A project intended to record materialisation
The contemporary articles survive in a May 2008 Psypioneer reprint drawn from William V. Rauscher’s collection. O’Neil’s account originally appeared in Psychic Observer on 10 July 1960; Puharich’s detailed report followed on 10 August. Their dates of publication must be distinguished from the sittings themselves.
O’Neil described the original purpose as recording materialisation, rather than exposing a medium. He had confidence in Edith Stillwell, who conducted the sittings, and Mable Riffle, the cabinet attendant and prominent camp organiser. Infrared lighting, motion-picture film and a viewing instrument offered a way to see movements in a room otherwise kept dark. The aim was to preserve what the participants believed would be persuasive evidence.
That starting position helps explain the editor’s account of disbelief when Puharich first described a concealed route. It also establishes the relationship between the two publications. They are accounts by collaborators at the same sessions, not two wholly independent experiments. Agreement between them has documentary value, but should not be counted as independent replication.
The route described by the investigators
Puharich described a curtained cabinet and a nearby door leading to Stillwell’s living quarters. He said curtains could form a passage between the door and cabinet. Through the infrared viewer, he reported seeing people enter by that route before emerging in the séance as purported spirit personalities, then leave through the same doorway.
His narrative distinguished observing through the viewer from making a satisfactory film. The equipment was not fully ready at the first sitting on 30 May. Lighting and photography improved during the following days. He described seeing the same performer adopt different roles and interpreting an apparent change of height as ordinary bodily movement. Those are specific proposed mechanisms, rather than a general assertion that unexplained activity must have been fraudulent.
O’Neil’s account says viewing processed footage changed his own assessment. He described Filmcraft Laboratories in Indianapolis processing their film and a doorway-to-cabinet movement visible in the results. His article also printed stills and comparisons with portraits from the newspaper’s files. Those suggested identifications belong to the investigators; this review has not attempted to identify people independently from facial resemblance.
The chairs and the final sitting
Both reports describe placing two chairs in front of the suspected access route on 2 June. No materialisation performance followed that evening. In Puharich’s account, the subsequent sitting on 3 June included Gladys Strohm and a renewed passage through the curtains, with the chairs moved aside. He said he photographed people entering and leaving, as well as the scene inside the opened cabinet.
The change in performance after obstructing a route was relevant to their argument. Its significance came from combining it with the claimed observation of that route in use. An otherwise uneventful séance would not, on its own, identify deception. Similarly, infrared equipment does not automatically guarantee a sound conclusion: what it recorded, the field of view and the sequence remain the substantive evidence.
The reprinted account contains a chronology problem that should remain visible. In the passage about delivering film for processing on 1 June, Puharich refers to film from 29 May, although his narrative places the first joint séance on 30 May. O’Neil identifies the footage viewed then as Tuesday’s. The discrepancy is not silently corrected here. The broad sitting sequence is clearer than that particular film-date reference.
What was reviewed, and what was not
This article draws on the two original participants’ published narratives as reprinted, together with the reprint editor’s historical framing. It is not a new examination of the original motion-picture reels. Some figure descriptions survive where the reprint notes that particular images were not reproduced. A reference to a photographed action must therefore remain attributed to its reporting investigator.
The 2008 introduction itself cautions that exposure allegations require scrutiny. That is a useful rule for reading the emphatic language of the 1960 articles. Emotional certainty, disappointment and striking headlines are part of the historical source, rather than substitutes for its detailed account. The strongest element of the published argument is the described ordinary access route and its observed use.
No contemporary court determination, admission by the accused participants or complete archive of their responses is claimed in this review. Neither does it establish the later publication history of Psychic Observer from the controversy alone. Those are different questions requiring their own records. Keeping the scope specific prevents a documented controversy becoming a larger story than the reviewed evidence supports.
Outcome: Closed (Explained), within the stated scope
The classification applies to the materialisation performances investigated and described by O’Neil and Puharich. Their contemporary reports identify a concrete human mechanism: performers moving through an adjoining door and curtained passage, with luminous clothing and changes of role. The explanation is attributed to them and their reported observations and filming; the original film has not been independently inspected for this article.
It is not a judgment on every medium who worked at Camp Chesterfield, every séance held there, Spiritualism generally or the present institution. O’Neil himself explicitly stopped short of treating all mediums as fraudulent. Nor should historical photographs of the camp be used to imply that the room shown in a modern image is the investigated room.
Location and sources
The map uses a broad Chesterfield town reference from the US Census Bureau’s Indiana place gazetteer. It does not identify a private residence, reconstruct the exact séance-room position or give visitor access instructions. The photograph supplies later geographic context only. No copyrighted film frame or newspaper portrait has been reused as an evidential illustration.
Read O’Neil’s July article and accompanying editorial, reprinted on pages 105–111, alongside Puharich’s August account, pages 112–118. The introduction begins before those articles and explains the reprint’s provenance and caution about allegations. Incident year: 1960. Source and outcome review: 13 November 2026.