Spirit Trumpets, Slates, and Ectoplasm Cabinets: Collecting the Physical Artifacts of Fraudulent Mediumship
Why This Category Rewards Serious Attention
The physical apparatus of fraudulent mediumship is among the most historically specific, most misattributed, and most aggressively faked category of antique conjuring material in circulation today. That combination makes it interesting. It also makes it expensive to get wrong.
Between roughly 1870 and 1930, physical mediumship reached its commercial and theatrical peak. Practitioners like Eusapia Palladino, Mina Crandon (“Margery”), William Eglinton, and dozens of lesser-documented operators built working careers around apparatus that was, in nearly every documented case, mechanical contrivance dressed in spiritual theater. The SPR investigated them. Houdini exposed several. Harry Price made a career of it. And yet the props survived, scattered across estate sales, magic collections, and the occasional psychology department storage room where someone’s grandfather donated “evidence.”
What you’re collecting, when you pursue this material seriously, is not evidence of fraud. You’re collecting evidence of craft. These were working performers with working props. Understanding how they were built tells you everything about how the deceptions functioned, and that context is what separates a collector from someone who just owns old things.
Spirit Slates: Reading the Object Honestly

The spirit slate is the most commonly encountered piece of genuine séance apparatus on the current market, and also the most frequently misrepresented. Let’s be direct about what you’re likely to find.
Genuine period slates (1870s through the early 1920s) were made from actual mineral slate, sourced primarily from Welsh quarries or, in American examples, from Peach Bottom slate in Pennsylvania and New York. The surface has a particular quality: a slight natural grain running in one direction, a tendency toward minor surface irregularity, and a matte texture that takes chalk well but never wipes perfectly clean. You will often see ghost impressions of old writing that no amount of cleaning fully removes. That’s not damage. That’s patina.
The frame construction is your first diagnostic. Period examples used simple cabinet joinery: mitered wood corners, typically oak or walnut, sometimes a painted pine. The hinge hardware on folding double slates was standard butt-hinge brass, often with a visible hand-filed fit. Machine-cut uniformity in the frame joinery is a red flag. So is any frame showing router work or an MDF core beneath paint.
Reproductions became a problem in two waves. The first came in the 1970s and 80s, when the market for spirit slates as stage magic apparatus grew. These were made for use, not deception, and most dealers were honest about them. The second wave is the current problem: estate sale finds where a 1980s reproduction slate has sat in a Victorian trunk long enough to acquire convincing dust and surface wear. Frame style, hinge hardware, and slate composition analysis will sort most of these out.
On condition grading: a spirit slate in genuinely usable performing condition, meaning both leaves intact, original hardware, minimal edge chipping, and legible ghost impressions, commands a real premium. Cracked or repaired slate surfaces reduce value significantly. Missing hardware, replaced hinges, and refinished frames all cut into price. A matched pair of double slates with documented provenance to a known medium’s collection is a rare find.
Authenticated period examples in good condition are currently appearing at auction between $800 and $3,500, depending on size, frame condition, and any paper trail. Reproductions without disclosure move for $40 to $200, which tells you something about the gap you’re navigating.
Spirit Trumpets: Aluminum, Luminous Paint, and What Survives
The aluminum folding spirit trumpet is probably the most visually striking object in this collecting category, and among the most straightforward to authenticate if you know what you’re examining.
Period trumpets were made in two basic formats: rigid single-piece cones and collapsible telescoping designs. The collapsible versions were favored by traveling mediums and by operations where props needed to vanish quickly. Photographs from SPR investigations of the Crandon sittings show specific models in use, which provides rare visual documentation for provenance cross-referencing.
The material is almost always aluminum, sometimes with a tin alloy, occasionally lacquered. Wall thickness on period examples is thin, often less than a millimeter, which gives them a distinctive lightweight feel and a characteristic ring when tapped. The luminous paint bands near the wide end were applied to make the trumpet visible in darkness, allowing sitters to track its “movement.” This paint, typically a zinc sulfide compound, has largely lost its charge capacity over a century, but under UV light you can still identify it clearly on authentic pieces. Some examples show brush application lines that are diagnostic.
Telescoping joint quality varies. Period examples show hand-fitted sections that slide with moderate resistance. Loose sections with significant play suggest heavy use or damage. Cracks at the joint transitions are common and reduce value but don’t necessarily compromise authenticity. Any modern aluminum alloy construction, recognizable by its bright surface finish, uniformly machined joints, and modern rivets, indicates a reproduction.
Market values for period trumpets in usable condition run from roughly $400 to $1,800. Matched pairs and examples with documented connection to specific practitioners carry premiums well above that range.
The Cabinet: What Actually Survives

The physical cabinet presents the most complex collecting problem in this category, because the cabinet itself rarely survives as a unified object. What you find are components: curtains, frames, the occasional purpose-built box.
The standard arrangement was simple. A curtained alcove, either using a doorway with a hung rod or a freestanding wooden frame, enclosed the medium during physical phenomena demonstrations. The curtain material was almost always heavy and dark, typically black or very deep blue wool or velvet. This was functional. Heavy material deadens sound and resists light penetration. It also hides a great deal of work.
Original cabinet curtains from documented séance operations are genuinely rare. Most were destroyed, repurposed, or discarded when the medium’s operation ended. Without clear provenance, a length of period black wool is just a length of period black wool. The more collectible survivors are purpose-built spirit cabinets: wooden boxes with hinged or sliding doors, built for stage use rather than parlor operation. These appeared in vaudeville acts and entertainment contexts that borrowed Spiritualist theater for theatrical effect. Herrmann, Kellar, and others incorporated cabinet work into stage programs. These objects are better documented and more likely to have traceable histories.
When evaluating curtain material: look at fiber composition (period wools have a specific hand and weave), seam construction (machine-sewn but with period stitch characteristics), and metal hanging hardware. Brass rings and wooden-backed hooks are period-consistent. Any modern plastic hardware or nylon thread disqualifies the piece.
Provenance Red Flags, Stated Plainly
Provenance in this collecting category is compromised almost by definition. Practitioners of fraudulent mediumship were not keen on documentation. Their estates were often dispersed quietly. And the century between then and now has been long enough for oral histories to wander far from fact.
Here are the specific red flags worth taking seriously:
- Undocumented “medium’s estate” claims. This phrase does more work than it should in auction catalog copy. Without a specific name, location, and at least some paper trail, it means nothing. Press for specifics. If specifics aren’t available, price accordingly.
- Suspiciously clean condition. Genuine period apparatus was used. Used apparatus shows use. Slate edges chip. Trumpet joints loosen. Curtain fabric fades unevenly. Objects in pristine condition require explanation.
- Perfectly matched sets sold together. A complete “séance kit” offered as a unified set is almost always a later assembly. Period practitioners gathered apparatus over time from multiple sources. Perfect matched sets are a modern assembly, not a historical reality.
- SPR or Houdini association claims. These appear constantly and are almost never verifiable. Houdini’s collection was documented and dispersed through known channels. SPR investigation material is largely archived in London. Casual auction claims of association with either are nearly always romantic inflation.
None of this makes provenance documentation worthless. A letter, a photograph, a newspaper clipping, a probate record, anything that anchors the object to a specific person or event adds genuine value and authenticity weight. The absence of documentation doesn’t prove a reproduction. It just means you’re buying on object quality alone, which is legitimate as long as the price reflects it.
Identifying Reproductions: The Specific Tests
The reproduction market for séance apparatus exists because demand exists. That demand comes from theatrical prop buyers, from collectors who didn’t know better, and from a smaller market of performers who want period-aesthetic pieces for presentation work. Most reproductions were made honestly for those purposes. The problem is secondary market migration: pieces sold honestly in 1985 now appear in estate sales stripped of context.
For spirit slates, test the slate composition. Mineral slate has a specific gravity around 2.7 to 2.8 and a cold feel that composite board doesn’t replicate. A small magnet held near the surface will confirm no ferrous backing. The frame wood grain and joinery style, examined under good light, will usually confirm or deny period construction.
For spirit trumpets, examine the aluminum alloy. Pre-1940 aluminum has a slightly different surface character than modern alloys, tending toward a warmer, slightly grayer tone rather than the bright silver of contemporary material. UV light examination for luminous paint traces is close to definitive. Modern reproductions either have no luminous coating or carry modern glow-in-the-dark material that looks entirely different under UV than zinc sulfide compounds. The difference is not subtle.
For cabinet components, period-appropriate fiber testing, metal hardware dating, and seam construction analysis are your tools. None of this is fast. It rewards patience and punishes impatience.
Building a Collection That Means Something
The collectors who do this category well are almost always performers or researchers first and investors second. The material is too specialized, the market too thin, and the authentication challenges too significant for casual accumulation to pay off consistently.
A coherent collection in this area does one of several things well: it traces a specific medium’s documented apparatus, it illustrates a particular technique or methodology such as direct voice, billet work, or materialization, or it assembles the working toolkit of a specific era of practice. Any of those angles gives a collection shape and makes the provenance research meaningful rather than arbitrary.
The current market has more material in circulation than most collectors realize. Auction houses that don’t specialize in conjuring material routinely mislabel and underprice pieces. The spirit slates that appear in antique mall cases are more often than not genuine period objects offered without any understanding of what they are. That gap is where serious collectors find value.
Know the literature before you spend seriously. Houdini’s A Magician Among the Spirits. Harry Price’s Confessions of a Ghost-Hunter. The SPR’s published reports from the Palladino investigations. Massimo Polidoro’s forensic work on the Crandon case. Understanding the operating context makes every object you examine more legible, and puts you well ahead of most buyers in this space.
This material connects performing history, social history, and the history of organized deception in ways that few other antique categories match. Treated seriously, it gives back in proportion to what you put in.
Arcane Relics carries a rotating selection of authenticated antique séance apparatus, spirit slates, and bizarre magic props for serious collectors and performers. Visit the Arcane Relics shop to see what is currently available, and browse the full catalog for rare additions to your collection or performance work.





















