This image is not available for purchase in your country.

Diagram of a device for opening doors

Diagram of a device for opening doors

V900/0024

Rights Managed

This image is not available for purchase in your country.

Please contact your Account Manager if you have any query.

Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Door opening device. Diagram of a device designed by Hero of Alexandria (flourished 1st century AD) to open temple doors. As the fire on the altar (at upper left) heated the air beneath it, the gas expands and forces its way into the sphere (at bottom left). The sphere contains water which is forced out by the gas into the bucket. When enough water has flowed into the bucket, its weight will overcome that of the weight (at bottom right) holding the doors closed. The bucket will descend, pulling on ropes which are wound around poles that are attached to the doors and so open them. Intricate devices like this were popular in Hero's time. Image taken from Hero's Pneumatics.

Release details

Model release not required. Property release not required.

 {{ i.shot_duration ? i.shot_duration + ' ' : '' }}{{ i.shot_uhd ? '4K ' : i.hires ? 'HD ' : '' }}{{ i.spl_number }} R{{ i.license }}

  • Add to board
  • Similar {{ mediaType(i) }}