Radiation and conductibility: Eider feathers are used to make eiderdowns because they retain a large amount of air and prevent convection. Anonymous illustration from 1925. Private collection.Anonymous Anonymous |
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Undated · Engraving
· Picture ID: 918233
colour · colours · engraving · physical · knowledge · heat · animal · bird · 20 20th 20th xx xxth 20th century · bianchetticor · energy · energy · Private Collection / Bridgeman Images |
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