Model or a fan. Model of a fan working as a double bellows. Part of the cover can be removed to show the inside. In the body, which has the shape of a circle segment on its point, moves a shelf back and forth, hinged in the tip. The shelf is drawn with ropes on either side. Simple valves consisting of a wooden valve on either side inside the air for turns. If the air is compressed on one side, it is discharged via a similar valve at the top to a round ventilation channel, one of which is mounted on each side.

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Size: 2500px × 1875px
Photo credit: © BTEU/RKMLGE / Alamy / Afripics
License: Licensed
Model Released: No

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