Hendershot Fuelless Motor

This source dossier collects material on the Hendershot "fuelless motor", a claimed self-powered electromagnetic motor attributed to the American inventor Hendershot's Fuelless Motor: The 1928 Press Record, the Ring-Magnet Models and the Bounded Evidence and associated with the 1920s–1930s era of American "free energy" press coverage. The dossier is hosted at [source note 3] and, in the ingested file, combines scanned patent-application pages and photographs with substantial explanatory text: Mark M. Hendershot's first-person account of his father's work, quoted 1928 newspaper coverage of the Selfridge Field demonstrations, the dispute with Dr. F. W. Hochstetter, and Lester Hendershot's own written theory of how the device was supposed to operate.

The subject is a claim, not a demonstrated result. Nothing in the supplied material reports a measured input/output energy balance, an independent replication, a peer-reviewed publication, or a named third-party test facility. The dossier's function is documentary: it preserves images of a patent application and of hardware attributed to the device.

What the dossier contains

The ingested file is image-oriented. Its identifiable artifacts are the image filenames referenced by the page:

The naming pattern (patapp…) indicates that the core of the dossier is a patent application — specification pages, at least one figure, and an attorney/assignee page. The supplied metadata does not include a patent number, application serial number, filing date, or grant date. No specific patent identifier can therefore be asserted here, and none is asserted.

The dossier includes hendershot-son-mark.jpg and a substantial first-person account by Mark M. Hendershot, the inventor's son, who describes witnessing the device power a television and sewing machine, recounts the Selfridge Field tests and the family's later history, and states that he spent over twenty-six years in the electrical trade intending to continue his father's work.

The claim

The core assertion, attributed to Hendershot and reproduced by the dossier rather than established by it, is that an electromagnetic motor can operate and deliver useful output without conventional fuel input — hence "fuelless." This is the specific instance of the broader Over-Unity Magnetic Motor Claim (Aspden) family, and it is treated on its own terms at Fuelless Motor Claim.

A patent application is a legal document asserting novelty and utility to a patent office. It is not a demonstration of function, and it is not evidence that a device produces net energy. A photograph of a device shows that an object existed and was photographed; it does not show that the object worked as claimed. The dossier supplies both categories of artifact and neither category of evidence.

How such devices are usually explained

Mainstream electromagnetic analysis accounts for the phenomena that "fuelless motor" claims typically invoke:

• Back-EMF (counter-EMF). A spinning motor winding generates an induced voltage opposing the driving current. Misreading this induced voltage, or the reactive power associated with it, as a net energy source is a recurring pattern in over-unity motor claims. See Back-EMF Motor-Generator Claim.
• Reactive and "radiant" power. Claims that a motor extracts "free" energy from reactive or radiant effects are treated at Radiant Reactive Power.
• Permanent-magnet work. Claims that static magnetic fields can be arranged to yield net mechanical work are treated at Monopole Motor Configuration in the context of the Bedini dossier.

None of these explanations is applied to Hendershot's specific hardware in the ingested file, because the file contains no circuit description, winding data, or measurement. The explanations are noted here as the standard analytical frame for the claim class, not as findings about this device.

Evidence status

The central claim is therefore unsupported by the source itself. This is a statement about the dossier's contents, not a verdict on the underlying physics; the dossier simply does not carry the kind of data that would settle the question either way.

Capture limitation

The ingested file is image-heavy but also contains substantial extractable text: Mark Hendershot's narrative, quoted newspaper reports, the Hochstetter controversy, the Mexico episode, the Cannon proposal, and Lester Hendershot's own written theory of operation. The patent-application pages themselves are supplied only as scanned images, so their specification text is not reproduced here.

Relation to other the source archive dossiers

This source belongs to an existing cluster of "free energy" and over-unity motor dossiers already documented in the wiki:

• Bedini Motor/Generator/Charger: The source archive Patent-and-Forum Dossier — Bedini Motor/Generator/Charger
• Harold Aspden — Collected Papers: The source archive Index Dossier — Harold Aspden collected papers
• E-Cat (Energy Catalyzer): Rossi and Focardi — A source Dossier — E-Cat (Rossi/Focardi)
• Jacques Ravatin: Form-Activation Patents and the source Dossier — Ravatin "Activator"

The Hendershot dossier reinforces the pattern those sources establish: the source archive dossiers on claimed free-energy devices consistently present patents, drawings, and photographs without energy-balance data or independent replication. It extends that pattern backward in time, to a pre-WWII American inventor distinct from the later Bedini, Aspden, and Rossi figures. It does not contradict any existing wiki content; it adds a historical instance to the same comparative finding, which is set out at Hendershot's Fuelless Motor: Claims, Witnesses and the Hochstetter Counter-Demonstration.

Open questions

1. Is the source text-sparse (image-only)? The ingested file suggests so. If the patent specification is legible in the original images, a future ingest could extract it.
2. What is the exact patent or application number? The supplied metadata does not include one, so no identifier is asserted in this article.
3. Does Mark Hendershot warrant a standalone entity page? Only a portrait filename is supplied; the material is currently too thin for a dedicated page.