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Pu's pendulum

The exhibit the unique phenomenon of the Proctor pendulum through electromechanical interaction.

Pu's pendulum — Basic Science exhibit for science museums
Studio rendering
CategoryBasic Science
TopicLight & shadow
InteractionElectromechanical, hands-on
Standard size1.3 x 1.3 x 2.1 m
SupplySingle unit or batch · OEM to your drawing
Lead timeStandard 4–8 weeks after deposit (confirmed per contract)
Warranty1 year, structure and control
DocumentsSpecification sheet · control diagram · spare-part list

A standard catalogue model: the dimensions, control package and finish are fixed, which is what keeps the price and the lead time predictable. Size, colour and interface language can be adapted without a new design cycle.

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01 / Overview

The exhibit the unique phenomenon of the Proctor pendulum through electromechanical interaction.

02 / How visitors use it

Interaction type: Electromechanical, hands-on. The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.

03 / The science behind it

When a small ball is suspended by a rope and oscillates back and forth in a plane, visitors using a light attenuation mirror to observe the swinging trajectory of the ball will notice that the trajectory of the ball changes from a single swinging trajectory to an elliptical trajectory. This phenomenon is due to the effect of filters that cause visual pauses in people, leaving the brain unable to react in time. The front image has not disappeared yet, and the back image immediately appears again, making it appear that the trajectory of the ball's swing has become elliptical.

04 / Built for a public floor

Every unit leaves the factory after a running test: mechanisms cycled, electronics burned in, edges dressed, fixings torqued and marked. Wear parts — bearings, sliders, lamps, belts, touch panels — are modular and listed on the spare-part sheet, so a venue technician can replace them without returning the exhibit. Crating is plywood with foam blocking; the loading plan and packing list travel with the shipment.

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