FE Meme
Foucault Pendulum Runs on Electromagnets?
#195: Foucault's pendulum does not show Earth's rotation; it is driven by an electromagnet under the bob inducing currents, illustrated with a charged-particle-in-magnetic-field diagram.
The Meme
Screenshot-style graphic quoting a hidden electromagnet under the bob and a textbook cyclotron diagram mislabeled as the real mechanism.
Why It Spreads
Museum Foucault rigs do hide maintenance gear, so a secret electromagnet under the bob sounds plausible to visitors who never read the placard. A real cyclotron diagram adds false lab credibility beside the claim. The screenshot format mimics investigative exposure.
What It Gets Wrong
A screenshot graphic quoting a hidden electromagnet under the bob and pairing it with a cyclotron particle diagram mislabeled as the real mechanism is invention, not a museum wiring schematic. Public Foucault installations are documented open pendulums whose precession rate equals sin(latitude) times Earth's rotation, about 360° per day at the poles and zero at the equator, matching 15°/hour × sin(latitude) from Paris to New Zealand. A hidden drive would require detectable energy input and would not naturally match latitude scaling worldwide, and a cyclotron diagram describes charged motion in magnetic fields, not a brass bob on a long wire. TestTheGlobe's Foucault Pendulum Strawman and TestTheGlobe's Earth Rotation Speed walk through the observations and predictions this image skips.
The Debunk
Foucault pendulums in open museums precess at 15°/hour × sin(latitude) without hidden electromagnets; ring-laser gyros read Earth rate with no bob at all. A screenshot graphic inventing a charged bob over a mislabeled cyclotron diagram is inconsistent with latitude-dependent periods reproduced from Paris to New Zealand. Use TestTheGlobe's Earth Rotation Speed to compare the meme's claim with a measurable prediction.
- TestTheGlobe's Foucault Pendulum Strawman: public installations match 15°/hour × sin(latitude) with documented drive only to maintain amplitude, not to fake precession rate.
- TestTheGlobe's Earth Rotation Speed quantifies the 360°/day spin pendulum paths track, inconsistent with a secret motor driven from one textbook homework diagram.
- The graphic quotes a hidden electromagnet under the bob and pairs it with a cyclotron particle diagram mislabeled as the real mechanism; that collage is invention, not a museum wiring schematic.
- TestTheGlobe's We Do Not Feel Earth Moving is separate from pendulum proof, and TestTheGlobe's Effective Gravity ties local g and latitude into the same rotating-spheroid framework pendulums sample.