
▷ 0:21 video
Electricity & magnetism
Electric Lighting Discovery Island
A three-lobed activity island links visitor controls with a large overhead light feature.
Product photograph · Real operating video

Air pressure
Compare the effort needed to separate paired hemispheres as air is removed and then returned.
THE PRODUCT IN MOTION
Compare the effort needed to separate paired hemispheres as air is removed and then returned.
Video & text guideTHE ACTIVITY & MECHANISM
Join the hemispheres and use the air-removal control. Compare the effort at the provided handle before and after air is returned. Lower pressure inside lets outside air pressure press the joined shells together, resisting separation. The bench provides three test units and a shared visitor panel.
Join the two hemispheres with their sealing surfaces aligned as instructed.
Use the air-removal control, then test the provided handle without exceeding the intended effort.
Restore air before separating the halves and connect the difference in response with pressure acting on the joined surfaces.
REFERENCE & PROJECT SCOPE
The photographs and video show this project configuration. Overall dimensions are approximate planning references; confirm the final supplied version, installation interfaces and clearances.
Approximate overall dimensions for the illustrated configuration, including its base. Visitor circulation and service access are additional; confirm the final envelope in the approved project drawing.
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