The double-headed eagle, representing the Holy Roman Empire, stands on a bobbin holding in its wings the outer sphere of the universe showing the elements of time from which the world is made: months, days, planets, signs of the zodiac, etc. Engraving by P. Miotte.

Licence: Public Domain Mark

Credit: The double-headed eagle, representing the Holy Roman Empire, stands on a bobbin holding in its wings the outer sphere of the universe showing the elements of time from which the world is made: months, days, planets, signs of the zodiac, etc. Engraving by P. Miotte. Wellcome Collection. Source: Wellcome Collection.